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Abayomi Ajayi is an assistant lecturer at the department of the Statistics Federal University of Agriculture, Abeokuta (FUNAAB). He received his MSc. (Statistics) at the Federal University of Agriculture Abeokuta on Comparison of Estimates on two occasion involving Stratification using Successive Sampling. He is currently on his PhD. in Statistics, his research interest includes Model based and Model Assisted Small area estimation of population proportion, Ratio and Regression Estimator, Complex Survey Inference and Distribution theory. He has co-authored several papers in qualified peer-reviewed journals. Before his appointment in FUNAAB, Mr. Ajayi has worked as a Mathematics teacher with Ogun state government via Federal Government NPOWER scheme, also worked as a part-time Data Analyst Yebatol Global Services helping undergraduate and post-graduate on experimental design, design and analysis of questionnaires and general data analysis by various Statistical Software like SPSS, R software, Megastat e.t.c. He is a member of Royal Statistical Society, International Biometrics Association, has presented papers in Statistical conferences. He is married with children.
M.Sc (Statistics), Federal University of Agriculture, Abeokuta 2016
B.Sc. (Statistics), Federal University of Agriculture, Abeokuta 2011
Sample Survey and Regression Analysis
COMMISSIONED PROJECTS
(i) Completed
Comparison of Estimates on two Occasions involving Stratification using Successive sampling. (M.Sc. Dissertation, 2015-FUNAAB)
Statistical Analysis in the selection of feeds for Broilers
(Final year project, June 2011 – UNAAB)
(ii) In Progress
A Predictive Model for Poverty Rates in Small Area Estimation for Two Stage Sampling. (Ph.D Dissertation in Progress)
i. Royal Statistical Society, London. Membership Number 123489 (2015)
ii. Member, International Biometrics Society
iii. Member International Association of Official Statistics (IAOS)
i. Nigeria Statistical Society Conference, Calabar, 2021.
Presented Paper: Ajayi A. O., Ayeleso, T. O., Olayiwola, O. M. & Wale-Orojo, O. A. (2021). A New Generalized Class of Exponential Ratio Type Estimators in Ranked Set Sampling.
ii. Nigeria Statistical Society Conference, Osogbo 2015.
Presented Paper: Olayiwola O.M., Apantaku F.S., Ajayi A.O. Comparison of Estimates on two Occasions involving Stratification using Successive sampling.
(i) Journal Articles in Print
Olayiwola O.M., Apantaku F.S. & Ajayi A.O. (2015): Comparison of Estimates on two Occasions involving Stratification using Successive sampling. Annals. Computer Science Series. 13 (2), 6065-7472, 94-102. Published by Tibiscus University of Timisoara, Romania. Available Available online at https://anale-informatica.tibiscus.ro/download/lucrari/13-2-11-Olayiwola.pdf.
Olayiwola O.M.., Ajayi, A. O. & Adegoke, Sarafa A. (2016): On A Modified Regression-Ratio Type Estimator for Homogeneous and Heterogeneous Populations. African Journal of Science & Nature 1, 1-4. ISSN 2536-6904. Published by Olabisi Onabanjo University.
Olayiwola O.M.., Ajayi, A. O. & Okunlade, Abiola A. (2016): A Modified Post-Stratified Regression Estimator for Two Occasions and Using Two Variables. African Journal of Science & Nature. 2, 1-5. 2536-6904. Published by Olabisi Onabanjo University.
Olayiwola O.M. & Ajayi A. O. (2016): A modified Multivariate Family of Estimators. FUNAI Journal of Science and Technology (FJST). FJST-16-002.
Oloko, A. L., Osebekwin, O. E., Dawodu, G. A., Omeike, M. O., Ajadi, N. A. & Ajayi A. O. (2017): A New Discrete Family of Reduced Modified Weibull Distribution. (2017): International Journal of Statistical Distributions and Applications. 3 (3) 25-31, doi:10.11648/j.ijsd.20170303.11
Olawale O. I., Wale-Orojo, O. A., Ajayi A. O., Olawoore S. A., Olakunle K. & Olaoye O. R. (2018): Dynamic Modelling of Registered Livebirths in Oyo State. Journal of the Nigerian Association of Mathematical Physics volume 44, pp 137 – 142. Published by Journal of the Nigerian Association of Mathematical Physics.
Olayiwola O. M., Apantaku F. S, Wale-Orojo O. A., Ajayi A. O. & Konku A. M. (2019): Probability Proportional to Size (PPS) Method to Enhance Efficiency of Estimator In Two Stage Sampling. Annals. Computer Science series. 17 (2), 2065-7472, 315-321, Published by Tibiscus University of Timisoara, Romania. Available online at https://anale-informatica.tibiscus.ro/download/lucrari/17-2-44-Olayiwola.pdf.
Olayiwola O. M., Ajayi A. O., Akintunde A. A., Wale-Orojo O. A., Ajibade F. B. & Ojelabi O. (2020): Estimation of the Population Mean in the Presence of Measurement and Response Error. Annals. Computer Science series. 18 (1), 2065-7472, 45-51, Published by Tibiscus University of Timisoara, Romania. Available online at https://anale-informatica.tibiscus.ro/download/lucrari/Vol18/18-1-07-Olayiwola.pdf.
Olayiwola, O. M., Ajayi, A. O., Onifade, O. C., Oluwaseun Wale-Orojo, O. A. & Ajibade, B. (2020): Adaptive cluster sampling with model-based approach for estimating total number of hidden COVID-19 carriers in Nigeria. Statistical Journal of the IAOS. 36 (2), S103–S109, 1-7. DOI:10.3233/SJI-200718
Olayiwola, O. M., Adekeye, K. S., Apantaku, F. S., Ajayi. A. O., Wale-Orojo, O. A., Ogunsola, I. A. & Hammed, B. (2021): Integration of Bayesian Model and Adaptive Cluster Sampling into Contact Tracing to curb the Spread of COVID -19 Cases. FUDMA Journal of Science (FJS) 5(1),76-84. Federal University Dutsin-Ma, Katsina State, Nigeria. Online at https://doi.org/10.33003/fjs-2021-0501-539
Ajayi, A. O., Ayeleso, T. O., Gboyega, A. F. & Adesina, O. S. (2023): A modified generalized class of exponential ratio type estimators in ranked set sampling. Scientific African. 19, e01447, 2468-2276, Published by ScienceDirect (Elsevier), https://doi.org/10.1016/j.sciaf.2022.e01447. (https://www.sciencedirect.com/science/article/pii/S2468227622003520)
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