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FOI Documents








Dr. Ahmed AUDU

Brief Biography

Dr. Ahmed Audu (PhD, MSc, BSc, ND Statistics, PD Education) is a senior lecturer at the Department of Statistics, Faculty of Physical and Computing Sciences, Usmanu Danfodiyo University, Sokoto, Nigeria. He is the current Faculty Examination Officer. His research interests are Sample Survey Methods and Inferences. He has published several articles in reputable journals. Dr Audu has supervised several undergraduate and postgraduate students in Statistics, Mathematics and Computer Science. He can be contacted via his email ahmed.audu@udusok.edu.ng and WhatsApp number +2348065350476

Area of specialization:i. Sampling Survey Methods and Inferences with Applications ii. Advanced Statistical Inferences iii. Statistical Computing and Applications
Email:ahmed.audu@udusok.edu.ng, ahmedgborom@yahoo.com , mheddu@yahoo.com
Phone:+2348065350476

List of Selected Publications

1. A. Audu, O. O. Ishaq, R. V. K. Singh, A. Danbaba and F. Manu (2023). On the study of efficiency of exponential-type estimator of population mean using robust regression methods. Quality and Reliability Engineering International, 39,190-205. (Indexed in SCOPUS, SCIMAGO Ranking: Q1) https://doi.org/10.1002/qre.3231
2. Ahmed Audu, Rajesh Singh and Supriya Khare (2023): New Regression-Type Compromised Imputation Class of Estimators with known Parameters of Auxiliary Variable. Communication in Statistics-Simulation and Computation, 52:10, 4789-4801. (Indexed in SCOPUS, SCIMAGO Ranking: Q2) https://doi.org/10.1080/03610918.2021.1970182
3. A. Audu, U. Usman, S. B. Mohammad and O. A. Joseph (2023). Enhanced Robust Estimators for Estimating Population Means When Confronted with Non-Response and Measurement Error. Asian Journal of Probability and Statistics, 25(2), 95-116. https://doi.org/10.9734/AJPAS/2023/v25i2556
4. A. Audu, A. Gidado, N. S. Dauran, S. A. Abdulazeez, M. A. Yunusa and I. Abubakar (2023). Modified Robust Regression-Type Estimators with Multi-Auxiliary Variables Using Non- Conventional Measures of Dispersion. Nigerian Journal of Basic and Applied Sciences, 31(1), 8- 25. ISSN: 0794-5698 http://dx.doi.org/10.4314/njbas.v31i1.2
5. Nura Musa, Ahmed Audu, Olusegun A. Joseph, Sulyman Muhammad, Abdulazeez Shehu, Ibrahim Abubakar, Mojeed A. Yunusa (2023). On the Efficiency of Modified Regression-Type Mean Imputation Scheme under Two-Phase Sampling. Caliphate Journal of Science and Technology, 2, 88-97. http://dx.doi.org/10.4314/cajost.v5i2.1
6. Adejumobi, A., Audu, A., Yunusa, M. A. and Singh, R. V. K. (2022). Efficiency of Modified Generalized Imputation Scheme for Estimating Population Mean with Known Auxiliary Information. Bayero Journal of Pure and Applied Sciences, 15(1): 105-112. http://dx.doi.org/10.4314/bajopas.v15i1.14
7. Ahmed Audu, Ran Vijay Kumar Singh, Olatunji Olawoyin Ishaq, Supriya Khare, Rajesh Singh & Adedayo Amos Adewara (2022): On the estimation of finite population variance for a mail survey design in the presence of non-response using new conventional and calibrated estimators, Communications in Statistics - Theory and Methods, 1-17. (Indexed in SCOPUS, SCIMAGO Ranking: Q3) https://doi.org/10.1080/03610926.2022.2093906
8. Ahmed Audu, Rajesh Singh, Supriya Khare and N. S. Dauran (2022): Almost Unbiased Variance Estimators Under the Simultaneous Influence of Non-response and Measurement Errors. Journal of Statistical Theory and Practice, 16(15), 1-14. (Indexed in SCOPUS, SCIMAGO Ranking: Q3) https://doi.org/10.1007/s42519-021-00226-8
9. Rajesh Singh, Prabhakar Mishra, Ahmed Audu and Supriya Khare (2022). Exponential Type Estimator for Missing Data under Imputation Technique. Revista Investigacion Operacional, 43(1), 639-644. (Indexed in SCOPUS) 10. Yusuf H. Aliyu, Amos A. Adewara, Ahmed Audu, Omotayo A. Abidoye, Issa Sulaiman, Muhammed B. Aliyu (2022). Modified Compromized Type Method of Imputation for Estimating Population Mean. Journal of Scientific Research, 66(1), 404-410. https://doi.org/10.37398/JSR.2022.660143
11. A. Audu, S. A. Abdulazeez, I. Abubakar, Y. M. Ahijjo, A. Gidado and M. A. Yunusa (2022). Modified Classes of Regression-Type Estimators of Population Mean in the Presences of Auxiliary Attribute under Double Sampling Scheme. Nigerian Journal of Basic and Applied Sciences, 30(2), 42-63. https://doi.org/10.4314/njbas.v30i2.6
12. A. Audu, S. A. Abdulazeez, A. Danbaba, Y. M. Ahijjo, A. Gidado and M. A. Yunusa (2022). Modified Classes of Regression-Type Estimators of Population Mean in the Presences of Auxiliary Attribute. Asian Research Journal of Mathematics, 18(1): 65-89. https://doi.org/10.9734/ARJOM/2022/v18i130355
13. A. Audu, A. Gidado, N. S. Dauran, S. Buda, S. A. Abdulazeez and M. A. Yunusa (2022). On the Efficiency of Modified Regression-type Estimators Using Robust Regression Slopes and Non- conventional Measures of Dispersion. Asian Research Journal of Mathematics, 18(2): 1-26. https://doi.org/10.9734/ARJOM/2022/v18i230356
14. Isah Muhammad, Yahaya Zakari and Ahmed Audu (2022). Generalized Estimators for Finite Population Variance using Measurable and Affordable Auxiliary Character. Asian Research Journal of Mathematics, 18(1), 14-30. https//doi.org/10.9734/ARJOM/2022/v18i130351
15. Muili, J. O., Singh, R. V. K., Onwuka, G. I. and Audu, A. (2022). New Calibration of Finite Population Mean of Combined Ratio Estimators in Stratified Random Sampling. FUDMA Journal of Sciences, 6 (4), 37 – 44. DOI: https://doi.org/10.33003/fjs-2022-0604-920
16. JAMIU OLASUNKANMI MUILI, RAN VIJAY KUMAR SINGH, GERALD IKECHUKWU ONWUKA and AHMED AUDU (2022). Calibration of Stratified Random Sampling with Combined Ratio Estimators. Oriental Journal of Physical Sciences, 7(1): 30-36. Doi: http://dx.doi.org/10.13005/OJPS07.01.05
17. AWWAL ADEJUMOBI, MOJEED ABIODUN YUNUSA, AHMED AUDU (2022). Improved Modified Classes of Regression Type Estimators of Finite Population Mean in the Presence of Auxiliary Attribute. Oriental Journal of Physical Sciences, 7(1): 41-47. Doi: http://dx.doi.org/10.13005/OJPS07.01.07
18. MOJEED ABIODUN YUNUSA, AHMED AUDU and AWWAL ADEJUMOBI: (2022). Logarithmic-Product-Cum-Ratio Type Estimator for Estimating Finite Population Coefficient of Variation. Oriental Journal of Physical Sciences, 7(2): 82-87. Doi: http://dx.doi.org/10.13005/OJPS07.02.05
19. MOJEED ABIODUN YUNUSA, AHMED AUDU and JAMIU OLASUNKANMI MUILI: (2022). On the Arithmetic Mean Estimators of a Family of Estimators of Finite Population Variance of Ratio Type. Oriental Journal of Physical Sciences, 7(2): 67-73. Doi: http://dx.doi.org/10.13005/OJPS07.02.03 20. A. Audu, R. Singh, S. Khare and N. S. Dauran (2021). Class of Estimators under New Calibration Schemes using Non-conventional Measures of Dispersion. Philippine Statistician, 70 (2), 23-42. . (Indexed in SCOPUS, SCIMAGO Ranking: Q4)
21. Isah Muhammad, Yahaya Zakari and Ahmed Audu (2021). An Alternative Class of Ratio- Regression-Type Estimator under Two-Phase Sampling Scheme. CBN Journal of Applied Statistics, 12 (2), 1-26. DOI: https://dx.doi.org/10.33429/Cjas.12221.1/5
22. Ahmed Audu, Rajesh Singh and Supriya Khare (2021): Developing calibration estimators for population mean using robust measures of dispersion under stratified random. STATISTICS IN TRANSITION new series, 22 (2), pp. 125–142. (Indexed in SCOPUS, SCIMAGO Ranking: Q4) https://doi.org/10.21307/stattrans-2021-019
23. Tolga Zaman, Emre Dunder, Ahmed Audu, David Anekeya Alilah, Usman Shahzad, and Muhammad Hanif (2021): Robust Regression-Ratio-Type Estimators of the Mean Utilizing Two Auxiliary Variables: A Simulation Study. Hindawi Mathematical Problems in Engineering, 1-9. (Indexed in SCOPUS, SCIMAGO Ranking: Q2) https://doi.org/10.1155/2021/6383927
24. A. Audu and R. V. K. Singh (2021): Exponential-Type Regression Compromised Imputation Class of Estimators. Journal of Statistics and Mgt Systems- Taylor and Francis, 24(6), 1253-1266. https://doi.org/10.1080/09720510.2020.1814501
25. Ishaq Olatunj Olawoyin, Audu Ahmed, Mathew Olaniyi Olayiwola and Sikiru Adeyinka Abdulazeez (2021). Chain ratio-type estimator of finite population mean under two-phase sampling in systematic sampling scheme. Annals of Optimization Theory and Practice, 4(1), 15- 28. https://doi.org/10.22121/AOTP.2021.259490.1058
26. Mathew Olaniyi Olayiwola, Ishaq Olatunj Olawoyin and Ahmed Audu (2021). New Exponential- Type Estimators of Finite Population Variance Using Auxiliary Information. Sri Lankan Journal of Applied Statistics, 22(2), 56-76. DOI: http://doi.org/10.4038/sljastats.v22i2.8047
27. Ahmed Audu, Rajesh Singh, Supriya Khare and N. S.Dauran (2021): Almost unbiased estimators for population mean in the presence of non-response and measurement error. Journal of Statistics and Management Systems, 24:3, 573-589, https://doi.org/10.1080/09720510.2020.1759209
28. A. Audu, O. O. Ishaq, A. Abubakar, K. A. Akintola, U. Isah, A. Rashida, and S. Muhammad (2021): Regression-type Imputation Class of Estimators using Auxiliary Attribute. Asian Research Journal of Mathematics, 17(5): 1-13. https://doi.org/10.9734/ARJOM/2021/v17i530296
29. A. Audu, A. Danbaba, S. K. Ahmad, N. Musa, A. Shehu, A. M. Ndatsu and A. O. Joseph (2021). On the Efficient of Almost Unbiased Mean Imputation When the Population Mean of Auxiliary Variable is Unknown. Asian Journal of Probability and Statistics, 15(4): 235-250. https://doi.org/10.9734/AJPAS/2021/v15i430377
30. Ran Vijay Kumar Singh, Bala Bin Saleh, and Ahmed Audu (2021): Modified Classes of Regression Type Exponential Estimators of Population Mean. Journal of Scientific Research, 65(5), 244-251. https://doi.org/10.37398/JSR.2021.650530
31. M. A. Yunusa, A. Audu, N. Musa, D. O. Beki, A. Rashida, A. B. Bello and M. U. Hairullahi (2021): Logarithmic Ratio-Type Estimator of Population Coefficient of Variation. Asian Journal of Probability and Statistics, 14(2): 13-22. https://doi.org/10.9734/AJPAS/2021/v14i230323
32. A. Audu, M. A. Yunusa, O. O. Ishaq, M. K. Lawal, A. Rashida, A. H. Muhammad, A. B. Bello, M. U. Hairullahi and J. O. Muili (2021): Difference-Cum-Ratio Estimators for Estimating Finite Population Coefficient of Variation in Simple Random Sampling. Asian Journal of Probability and Statistics, 13(3): 13-29. https://doi.org/10.9734/AJPAS/2021/v13i330308
33. Ahmed Audu, Mojeed Abiodun Yunusa, Aminu Bello Zoramawa, Samaila Buda and Ran Vijay Kumar Singh (2021). Exponential-Ratio-Type Imputation Class of Estimators using Nonconventional Robust Measures of Dispersions. Asian Journal of Probability and Statistics, 15(2): 59-74. https://doi.org/10.9734/AJPAS/2021/v15i230351
34. J. O. Muili and A. Audu (2021). Estimation of Finite Population Mean of Median Based using Power Transformation. Oriental Journal of Physical Sciences, 6(1-2), 26-31. http://dx.doi.org/10.13005/OJPS06.01-02.05
35. Jamiu Olasunkanmi Muili, Ahmed Audu and Ibrahim Yunusa Adamu (2021). On The Efficiency of Ratio Estimators of Finite Population Mean using Auxiliary Information. Oriental Journal of Physical Sciences, 6(1-2), 7-14. http://dx.doi.org/10.13005/OJPS06.01-02.03 36. Ahmed Audu (2021). Large-Scale Sample Survey Data: An Alternative to Population Data for Sustainable Development in the 21 st Century. Proceeding of Royal Statistics Society Nigeria Local Group, 1-11.
37. A. Audu, O. O. Ishaq, U. Isah, S. Muhammed, K. A. Akintola, A. Rashida, A. Abubakar (2020) On the Class of Exponential-Type Imputation Estimators of Population Mean with Known Population Mean of Auxiliary Variable. NIPES Journal of Science and Technology Research 2(4), pp.1 – 11. https://doi.org/10.37933/nipes/2.4.2020.1
38. A. Audu, O. O. Ishaq, J. O. Muili, A. Abubakar, A. Rashida, K. A. Akintola, U. Isah (2020). Modified Estimators of Population Mean Using Robust Multiple Regression Methods. NIPES Journal of Science and Technology Research 2(4), pp.12 – 20. https://doi.org/10.37933/nipes/2.4.2020.2
39. O. Ejima, K. O. Aremu and A. Audu (2020): Energy of inverse graphs of dihedral and symmetric groups. Journal of the Egyptian Mathematical Society, 1-10. https://doi.org/10.1186/s42787-020- 00101-8 .
40. A. Audu, R. V. K. Singh, S. Muhammed, O. O. Ishaq and Y. Zakari (2020): On the Efficiency of Calibration Ratio Estimators of Population Mean. Proceeding of Royal Statistics Society Nigeria Local Group, 247-261. 41. A. Audu, A. Danbaba, A. Abubakar, B. Nakone and O. O. Ishaq (2020): On the Efficiency of Calibration Ratio-Cum-Product Estimators of Population Mean. Proceeding of Royal Statistics Society Nigeria Local Group, 234-246.
42. O.M. Olayiwola, A. Audu, O. O. Ishaq, S.A. Olawoore, A. Ibrahim (2020): A Class of Ratio Estimators of Finite Population Mean Using Two Auxiliary Variables Under Two-phase Sample Scheme. Proceeding of Royal Statistics Society Nigeria Local Group, 80-95.
43. Audu, A., Ishaq O. O., Muili, J., Zakari, Y., Ndatsu, A. M. and S. Muhammed (2020): On the Efficiency of Imputation Estimators using Auxiliary Attribute. Continental J. Applied Sciences, (1), 1-13. https://doi.org/10.5281/zenodo.3721046
44. R. Singh, P. Mishra, A. Audu and S. Khare (2020): Exponential Type Estimator for Estimating Finite Population Mean. Int. J. Comp. Theo. Stat., 7(1), 37-41. Available: http://dx.doi.org/10.12785/ijcts/070104
45. Ahmed Audu, Ishaq Olatunji Olawoyin, Yahaya Zakari, Daniel Dauda Wisdom, Jamiu Muili and Abdulaziz Mohammed Ndatsu (2020): Regression-cum-exponential ratio imputation class of estimators of population mean in the presence of non-response. Science Forum Journal of Pure and Applied Science, 20, 58-63. DOI: http://dx.doi.org/10.5455/sf.71109
46. J. O. Muili, E. N. Agwamba, Y. A. Erinola, M. A. Yunusa, A. Audu and M. A. Hamzat (2020): Modified Ratio-cum-product Estimators of Finite Population Variance. International Journal of Advances in Engineering and Management, 2(4), 309-319. https://doi.org/10.35629/5252- 0204309319
47. J. O. Muili1, E. N. Agwamba, Y. A. Erinola, M. A. Yunusa, A. Audu and M. A. Hamzat (2020): A Family of Ratio-Type Estimators of Population Mean using Two Auxiliary Variables. Asian Journal of Research in Computer Science. https://doi.org/10.9734/AJRCOS/2020/v6i130152
48. Olatunji Olawoyin Ishaq, Ahmed Audu, Auwalu Ibrahim, Hassan S. Abdulkadir, Kabiru (2020): On the linear combination of sample variance, ratio, and product estimators of finite population variance under two-stage sampling. Science Forum Journal of Pure and Applied Science, 20, 307- 315. DOI: http://dx.doi.org/10.5455/sf.90563
49. Muili, J. O., Zakari, Y. and Audu, A. (2019): Modified Class of Estimator of Finite Population Variance. FUDMA Journal of Sciences, 3 (4), 67-78.
50. Joshua Oluwasegun Abioye, Amos Adedayo Adewara, Audu Ahmed and Femi Emmanuel Amoyedo (2019): Modification of Ratio-Cum-Product Estimators of Population Mean in Linear Systematic Sampling under Two-Phase Sampling Scheme. FUW Trends in Science and Technology Journal, 4(3), 882-891.
51. Adamu Isah Kamba, Amos Adedayo Adewara and Audu Ahmed (2019): Modification of Ratio Estimator under Two-Phase Sampling. FUW Trends in Science and Technology Journal, 4(2), 495-500.
52. Adamu Isah Kamba, Amos Adedayo Adewara and Audu Ahmed (2019): Modified Product Estimator under Two-Phase Sampling. Global Journal of Pure And Applied Sciences, 25, 201- 208. DOI: https://dx.doi.org/10.4314/gjpas.v25i2.10
53. J.O. Muili, A. Audu and R. V. K. Singh (2019): Modified Estimator of Finite Population Variance in Simple Random Sampling. Journal of Science and Technology Research 1(1), 81-90.
54. J.O. Muili, A. Audu, A.B. Odeyale, and I.O. Olawoyin (2019): Ratio Estimators for Estimating Population Mean Using Tri-mean, Median and Quartile Deviation of Auxiliary Variable. Journal of Science and Technology Research, 1(1), 91-102
55. J.O. Muili, R. V. K. Singh and A. Audu (2018): Study of Efficiency of Some Finite Population Variance Estimators in Stratified Random Sampling. Continental J. Applied Sciences, 13 (2), 1-17.
56. Yahaya Muhammad Abdullahi, Ibrahim Muhammad Magami, Ahmed Audu, Muhammad Murtala Mainasara (2018): Prevalence of Ticks on Camels and Cattle Brought to Dodoru Market Kebbi State, Nigeria. Traektoria=Pathof Science, 4 (4), 3001-3004. https://doi.org/10.22178/pos.33-4
57. A. Audu and A. A. Adewara (2017): A Factor-Type Estimator with Known Functions of Auxiliary variable under Single-Phase Sampling. ABACUS, Mathematics Science Series, 44(1), 171-177.
58. Ahmed Audu and Adedayo Amos Adewara (2017): Robustness of Modified Factor-Type Estimators under Super-Population Model. Journal of Nigerian Association of Mathematical Physics, 40, 223-230. ISSN 1116-4336.
59. A. Audu and A. A. Adewara (2017): Modified Factor-Type Estimators under Two-Phase Sampling. Punjab Journal of Mathematics, 49(2), 59-73. ISSN: 1016-2526.
60. A. Audu and A. A. Adewara (2017): Modified Factor-Type Estimators with Two Auxiliary variables under Two-Phase Sampling. Anale. Seria Informatica, 15(1), 63-76. ISSN: 1583-7165 (P), 2065-7471 (O).
61. A. Audu and A. A. Adewara (2017): Robustness of Modified Factor-Type Estimators under Non- response Model. Anale. Seria Informatica, 15(1), 31-40. ISSN: 1583-7165 (P), 2065-7471 (O).
62. A. Audu and A. A. Adewara (2017): Some Modified Factor-Type Estimators in Sample Survey. Proceeding of Mathematical Association of Nigeria.
63. A. Audu and A. A. Adewara (2017): Some Modified Factor-Type Estimators with Two Auxiliary Variables in Sample Survey. Proceeding of Mathematical Association of Nigeria.
64. Ishaq Olawoyin Olatunji, Akeem Ajibola Adepoju, Abdulmuahymin Abiola Sanusi and Audu Ahmed (2017): Reviewing of the Relationship between Body Mass Index and High Blood Pressure of Patients. International Journal of Statistics and Actuarial Science, 1 (2), 19-23
65. Audu A. and Ishaq O. O. (2016): Isaki (1983) and Olufadi and Kadilar (2014) Variance Estimators under Transformation of Sample Means. Journal of Nigerian Association of Mathematical Physics, 38, 167-172. ISSN 1116-4336.
66. Ishaq O. O. and Audu A (2016): Alternative to Mohanty (1967) and Samiuddin and Hanif (2006) Regression-Cum-Ratio Finite Population Mean Estimators. Journal of Nigerian Association of Mathematical Physics, 38, 173-178. ISSN 1116-4336.
67. Ahmed A., Nurudeen O., Zakari Y, Sulaiman I and Ibrahim A. (2016): Modification of Yadav and Kadilar (2013) Ratio and Product Estimators for Finite Population Mean. Proceedings of September 2016 Annual Conference of Mathematical Association of Nigeria, Pp 197-202. ISBN: 97-35224-6-9
68. Audu Ahmed, Adedayo Amos Adewara and Ran Vijay Kumar Singh (2016): Improved Class of Ratio Estimators for Finite Population Variance. Global Journal of Science Frontier Research: Mathematics and Decision Sciences, 16(2), Pp. 175-183. ISSN: 2249-4626 (O), 0975-5896 (P)
69. Audu Ahmed, Adedayo Amos Adewara and Ran Vijay Kumar Singh (2016): Class of Ratio Estimators with known Functions of Auxiliary Variable for Estimating Finite Population Variance. Asian Journal of Mathematics and Computer research, 12(1), Pp. 63-70. ISSN: 2395- 4205 (P), 2395-4213 (O)
70. Lawal, H., Ahmed, A. and Tasiu, M. (2016): Evaluating ARIMA Models on the Current Account Deficit in Nigeria using Symmetric Loss Functions. Equity Journal of Science and Technology, 4(1), 86-92. ISSN: 2354 1814
71. Audu Ahmed, Ran Vijay Kumar Singh and Adedayo Amos Adewara (2016): Ratio and Product type Exponential Estimators of Population Variance under transformed Sample Information of Study and Supplementary Variables. Asian Journal of Mathematics and Computer research, 11(3), Pp. 175-183. ISSN: 2395-4205 (P), 2395-4213 (O)
72. Audu Ahmed and Adewara Adedayo Amos (2016): Alternative to Factor-Type Estimators under Single Phase Sampling. Katsina Journal of Natural and Applied Sciences, 5(1), 1-7. ISSN 2141- 0755.
73. Ran Vijay Kumar Singh and Ahmed Audu (2015): Improved Exponential Ratio–Product Type Estimator for finite Population Mean. International Journal of Engineering Science and Innovative Technology, 4(3), Pp. 317-322. ISSN: 2319-5967
74. R. V. K. Singh, A. Ahmed and A. Y. Shero (2015): Improved Class of Ratio Type Estimator under Double Sampling. Continental J. Applied Sciences, 10(1), Pp. 43-49. ISSN: 1597-9928 75. Audu A. Singh, R.V.K, Aliyu H. and Abdulmuahimin A. S. (2015): Multivariate Analysis of Variance on the Effect of Row Spacing and Weed Control Methods on the Performance of Maize. Equity Journal of Science and Technology, 3(1), Pp.80-85. ISSN: 2354-1814
76. Ahmed Audu and Ran Vijay Kumar Singh (2015): Improved Exponential Type Estimators for Estimating Population Variance Survey Sampling. International Journal of Advance Research, 3(4), Pp. 1-16. ISSN:2320-9143
77. Lawal H. and Ahmed A. (2015): On the Relative Efficiency of Double Sampling for Regression type Estimator. Proceedings of September 2015 Annual Conference of Mathematical Association of Nigeria, Pp 503-508. ISBN: 97-35224-6-9
78. Ran Vijay Kumar Singh and Ahmed Audu (2015): Improved Exponential Ratio and Product Type Estimators for Finite Population Mean under Double Sampling Scheme. International Journal of Scientific and Engineering Research, 2(4), Pp. 509-514. ISSN:2229-5518
79. Hussaini Lawal, Ahmed Audu and Tasi’u Musa (2015): Forecasting Nigerian Stock Index Based on Asymmetry GARCH Models. Continental J. Applied Sciences, 10(1), Pp. 1-10. ISSN: 1597-9928
80. Ran Vijay Kumar Singh, Abdulmuahimin A. Sanusi and Ahmed Audu (2014): Analysis of Science Students’ SSCE Result Using Principal Component Analysis. Continental J. Education Research, 7(1), Pp. 24-29.ISSN: 2141-4181
81. Singh R.V.K. and Ahmed A. (2014): Ratio-type Estimators in Stratified Random Sampling Using Auxiliary Attribute. Proceedings of the International MultiConference of Engineers and Computer Scientists 2014 Vol. I, ISSN: 2078-0958(PRINT), ISSN:2078-0966 (ONLINE)
82. Singh R.V.K., Omofoye P. B., Babayemi A. W. and Ahmed A. (2014): Improved Ratio-Type Estimator by Using Unknown Weight. Equity Journal of Science and Technology, 2(1), Pp.151- 154. ISSN: 2354-1814
83. James T. O., Ahmed A., Nwogu J. and Onwuka G. I. (2014): Analyses of Students’ Performances, Mode of Entrance and Their Attitude toward Mathematics and Pure Sciences courses: A Case Study of Mathematics and Biochemistry Departments, KSUSTA. Equity Journal of Science and Technology, 2(1), Pp.137-140. ISSN: 2354-1814
84. Ran Vijay Kumar Singh and Ahmed Audu (2013): Efficiency of Ratio Estimators in Stratified Random Sampling Using Information on Auxiliary Attribute. International Journal of Engineering Science and Innovative Technology, 2(1), Pp. 166-172. ISSN: 2319-5967
85. Ran Vijay Kumar Singh, Abd-Elfatai A. Mohammed, Ahmed Audu and Abdulmuahimin A. Sanusi (2013): Efficiency Comparison of Ratio Type Estimators. Continental J. Applied Sciences, 8(2), Pp. 34-39. ISSN: 1597-9928
86. Ran Vijay Kumar Singh, Abdulmuahimin A. Sanusi and Ahmed Audu (2013): Analysis of Science Students’ SSCE Result Using Canonical Correlation Analysis. Continental J. Education Research, 6(1), Pp. 22-26. ISSN: 2141-4181
CONFERENCE/PAPER PRESENTATION
1. Ahmed Audu (2022). Large-Scale Sample Survey Data: An Alternative to Population Data for Sustainable Development in the 21st Century. A Paper presented at 2nd International Conference of Royal Statistics Society Nigeria Local Group, FUNAB, Abeokuta.
2. Muili, J. O., Audu, A., and Adebiyi, A. (2022). Improved Ratio-Cum-Product Estimator for Estimation of Finite Population Mean. A Paper Presented at 6th International Conference of Professional Statisticians Society of Nigeria (PSSN) held at Yaba College of Technology, Yaba, Lagos State, Nigeria on 27th – 30th June, 2022.
3. Muili, J. O., Audu, A., and Yunusa, M. A. (2022). Logarithmic-Type Ratio Estimator for Estimation of Finite Population Mean. A Paper Presented at 6th International Conference of Professional Statisticians Society of Nigeria (PSSN) held at Yaba College of Technology, Yaba, Lagos State, Nigeria on 27th – 30th June, 2022.
4. Muili, J. O., Singh, R. V. K., Onwuka, G. I. and Audu, A., (2021). Development of Calibration Combined Ratio Estimators of Finite Population Mean in Stratified Random Sampling. A Paper Presented at 1st International Conference of the Nigerian Institution of Professional Engineers and Scientists (NIPES) held at University of Benin, Edo State, Nigeria on 7th – 8th October, 2021.
5. Muili, J. O., Singh, R. V. K., Audu, A., Onwuka, G. I. and Babayemi, A. W. (2021). Efficient Distance Function for Calibration Estimators in Stratified Random Sampling. A Paper Presented at 5th International Conference/2nd Virtual Conference of Professional Statisticians Society of Nigeria (PSSN) held at University of Ilorin, Kwara State, Nigeria on 5th – 8th July, 2021.
6. Muili, J. O., Audu, A., Onwuka, G. I. and James T. O. and Yunusa, I. A. (2021). Enhancement of Ratio Estimators of Finite Population Mean. A Paper Presented at 5th International Conference/2nd Virtual Conference of Professional Statisticians Society of Nigeria (PSSN) held at University of Ilorin, Kwara State, Nigeria on 5th – 8th July, 2021.
7. Muili, J. O., Audu, A. and Agwamba, E. N. (2021). A New Ratio-Cum-Product Estimator of Finite Population Mean. A Paper Presented at 39th Annual Conference of the Nigerian Mathematical Society (NMS) held at Redeemer’s University, Ede, Osun State, Nigeria on 20th – 24th April, 2021.
8. Muili, J. O., Singh, R. V. K., Audu, A. and Babayemi, A. W. (2020). On the Efficiency of Calibration Combined Ratio Estimators in Stratified Random Sampling. A Paper Presented (Virtual) at 4th International Conference of Professional Statisticians Society of Nigeria (PSSN) held on 24th – 26th August, 2020. Edited Proceedings of 4th International Conference, Vol. 4, Pp.755 – 767. 2020.
9. A. Audu, R. V. K. Singh, S. Muhammed, O. O. Ishaq and Y. Zakari (2020): On the Efficiency of Calibration Ratio Estimators of Population Mean. A Paper presented at 1st International Conference of Royal Statistics Society Nigeria Local Group, FUNAB, Abeokuta.
10. A. Audu, A. Danbaba, A. Abubakar, B. Nakone and O. O. Ishaq (2020): On the Efficiency of Calibration Ratio-Cum-Product Estimators of Population Mean. A Paper presented at 1st International Conference of Royal Statistics Society Nigeria Local Group, FUNAB, Abeokuta.
11. O.M. Olayiwola, A. Audu, O. O. Ishaq, S.A. Olawoore, A. Ibrahim (2020): A Class of Ratio Estimators of Finite Population Mean Using Two Auxiliary Variables Under Two-phase Sample Scheme. A Paper presented at 1st International Conference of Royal Statistics Society Nigeria Local Group, FUNAB, Abeokuta.
12. Muili, J. O., Yunusa I. A., Audu, A. and Odeyale, A.B. (2019). Modified Estimator of Finite Population Variance. A Paper presented at 2nd Arewa Mathematical Association of Nigeria (MAN) Conference held at Waziri Ummaru Federal Polytechnic Kebbi Birnin, Kebbi State, Nigeria on 1st – 4th April, 2019.
13. A. Audu, O. O. Ishaq (2019). Linear Combination of Exponential Type Estimator of Population Mean using Information on Sample Size. A Paper presented at 30th Colloquium of the Nigerian Association of Mathematical Physics Conference 2019, Igbinedion University Okada, Edo State.
14. A. Audu, O. O. Ishaq (2019). Regression-cum-Ratio Estimators for Population mean using Information on Sample Size. A Paper presented at 30th Colloquium of the Nigerian Association of Mathematical Physics Conference 2019, Igbinedion University Okada, Edo State.
15. A. Audu, O. O. Ishaq, N. S. Dauran and Y. Zakari (2019). Generalized Almost Unbiased Mean Estimators under the Effect of Non-Response. A Paper presented at 53rd Science Association of Nigeria Conference 2019, UDUS, Sokoto.
16. M. Ndatsu and A. Audu (2019). On the Linear Combination of Some Ratio-cum-product Estimators under Stratified Random Sampling. A Paper presented at 53rd Science Association of Nigeria Conference 2019, UDUS, Sokoto.
17. O. O. Ishaq, A. Audu and A. I. Usman (2019): Effects of Linear Regression on Estimator of Population Mean in Stratified Random Sampling under Non-Response. A paper presented at the 3rd International Conference of Professional Statisticians Society of Nigeria held on 17th-20th June, 2019 at Ahmadu Bello University Zaria, Kaduna State.
18. A. Audu, O. O. Ishaq, and S. Abdulmalik (2019): Effects of Power Transformation Scheme on Estimator of Population Mean under Non-Response. A paper presented at the 3rd International Conference of Professional Statisticians Society of Nigeria held on 17th-20th June, 2019 at Ahmadu Bello University Zaria, Kaduna State.
19. A. Audu, O. O. Ishaq and A. I. Usman (2019): Finite Population Mean Estimator withTwo Auxiliary Variables under Single-Phase Stratified Random Sampling Scheme. A paper presented at the 3rd International Conference of Professional Statisticians Society of Nigeria held on 17th-20th June, 2019 at Ahmadu Bello University Zaria, Kaduna State.
20. A. Audu, O. O. Ishaq and A. I. Usman (2019): Ratio and Product Exponential Type Estimators under Systematic Sampling using Unknown Weight under Two-Phase Sampling. A paper presented at the 3rd International Conference of Professional Statisticians Society of Nigeria held on 17th-20th June, 2019 at Ahmadu Bello University Zaria, Kaduna State.
21. A. Audu and A. A. Adewara (2017): Some Modified Factor-Type Estimators in Sample Survey. 54th Annual National Conference by Mathematical Association of Nigeria at Yaba College of Science and Technology, Lagos, Nigeria.
22. A. Audu and A. A. Adewara (2017): Some Modified Factor-Type Estimators with Two Auxiliary Variables in Sample Survey. 54th Annual National Conference by Mathematical Association of Nigeria at Yaba College of Science and Technology, Lagos, Nigeria.
23. R. V. K. Singh, S. H. Habibu and A. Audu (2017): Class of Ratio and Product Type estimators under Stratified Random Sampling. 54th Annual National Conference by Mathematical Association of Nigeria at Yaba College of Science and Technology, Lagos, Nigeria.
24. A. Audu and Adewara A. A. (2017): A Factor-Type Estimator with known Functions of Auxiliary Variable in Single Phase Sampling. 8th International Science, Technology, Education, Arts, Management and Social Sciences (iSTEAM) Conference at Caleb Univrersity Lagos, Nigeria.
25. Ishaq, O. O., Audu, A. and Ayodele Adebiyi (2017): Transformation of Ratio and Product Estimators of Yadav et al. (2013) for Finite Population Mean. 8th International Science, Technology, Education, Arts, Management and Social Sciences (iSTEAM) Conference at Caleb Univrersity Lagos, Nigeria.
26. Ishaq, O. O. and A. Ahmed (2017): Invetigation of the Impact of some Determinant on Attainment of PhD Grade using Ordinal Logistic Regression. Nigeria Statistical Society 1st International Conference at Ibadan, Oyo State.
27. O. O. Ishaq, and A. Audu (2017): Two Factors Exponential Type Estimator for Population Mean under Single Phase Sampling Scheme. International Conference on Contemporary Mathematics and the Real world at University of Ibadan, Oyo State.
28. Audu A., Ishaq, O. O., Dauran, N. S., Saleh, B. B. and Ibrahim, A. (2016): Improved Ratio and Product-Cum Estimators for Finite Population Mean. Nigerian Association of Mathematical Physics conference at Abia State.
29. Audu A., Ishaq, O. O., Dauran, N. S. and Ganiyu Y. (2016): Improved Variance Estimators under Simple Random Sampling. Nigerian Association of Mathematical Physics conference at Abia State.
30. Audu A., Ishaq, O. O., Muhammad, A. and Nurudeen, O. (2016): Dual to Mohahty (1967) and Samiuddin and Hanif (2006) Regression-Cum-Ratio Estimators for Finite Population Mean. Nigerian Association of Mathematical Physics conference at Abia State.
31. A. Ahmed, A.A. Adewara and R. V. K. Singh (2016): Alternative to Factor-Type Estimator under Two-Phase Sampling. Science Association of Nigeria Conference 2016 at Abuja.
32. O. Tunde, A. Danbaba and A. Ahmed (2016): Evaluation of Parametric Pair-Wise Multiple Comparison Procedures under some Probability Distributions. Science Association of Nigeria Conference 2016 at Abuja.
33. A. Ahmed and H. Lawal (2015): Two Factors Exponential Type Estimator for Population Mean under Single Phase Sampling Scheme. Nigerian Statistical Association Conference (2015) at Ilorin
34. A. Ahmed and R. V. K. Singh (2015): A Class of Product Strategies with Unknown Weight for Finite Population Mean in Sampling Survey. Nigerian Statistical Association Conference (2015) at Ilorin.
35. A. Ahmed, H. Lawal and James T. O (2015): Ratio and Product Strategies with Unknown Weight for finite Population. Mathematical Association of Nigeria Conference (2015) at Uyo, Akwa Ibom State.
Google Scholar ID: https://scholar.google.com/citations?hl=en&user=4nEcnd0AAAAJ LinkedIn ID: https://www.linkedin.com/in/ahmed-audu-96a285a6 ResearchGate ID: https://www.researchgate.net/profile/Ahmed-Audu-3 ORCID: https://orcid.org/0000-0002-6915-7589 SCOPUS ID: https://www.scopus.com/authid/detail.uri?authorId=57215302839 Web of Science Researcher ID: https://publons.com/researcher/ADA-1598-2022/