Dr. Josephine Nneamaka Onyeka-Ubaka

Selected Recent Publications / Contributions to Knowledge

1. U. Okorafor, J. N. Onyeka-Ubaka(2025). Multiple Regression Analysis of the Impact of some Selected Macro – Economic Variables on the Gross Domestic Product (GDP). International Journal of mathematical Sciences and Optimization: Theory and Applications, 11(1): 75-89.
2. Josephine Nneamaka Onyeka-Ubakaand Kingsley Chimezie Ohanmo (2024). Volatility and Risk Analysis of Selected Companies in Nigerian Stock Exchange. Unilag Journal of Mathematics and Applications. ISSN 2805 3966, 4(2): 15-37.
3. M. Ikegwu and J. N. Onyeka-Ubaka(2024). Markov Switching Autoregressive Model: A Volatility Model with Application to All Share Index Returns. International Journal of Mathematical Sciences and Optimization: Theory and Applications, 10(3): 94 – 104.
4. Odekina, O.G. and Onyeka-Ubaka, J. N. (2024). On the Parameter Estimation of a New Innovation Distribution for GARCH (1,1) Model. Nigerian Journal of Scientific Research, 23(2):418-422.
5. Josephine N. Onyeka-Ubakaand Olaide Abass (2023). The Estimation of Heavy Tails in Non-linear Models. Tanzania Journal of Science, ISSN 0856-1761, e-ISSN 2507-7961; 49(2): 332-343.

Collaborations / Networks

Collaborations have not been added yet.