Hycinth C. Iwu

Forecasting Renewable Energy Shares Using ARIMA and a Grey-Box Model: Evidence from Four Developed and Developing Economies

Hycinth C. Iwu, D. C. Bartholomew, O. C. Abiahu & K. T. Onyeawugosi · Journal of Energy Research and Reviews · 2026

This study evaluates ARIMA and hybrid Grey-Box models for forecasting the share of renewable energy in total final energy consumption in Angola, Canada, France, and Nigeria. Annual World Bank data from 1990 to 2021 were analysed using exploratory analysis, stationarity testing, a...

Open access Research Article 10.9734/jenrr/2026/v18i11549

On the Effects of Missing Values on Estimates of Trend Parameters and Seasonal Indices in Descriptive Time Series Analysis

Lawrence C. Kiwu, Eleazar C. Nwogu, Chukwudi J. Ogbonna, Hycinth C. Iwu & Iheanyi S. Iwueze · Archives of Current Research International · 2025

In literature, when missing values are observed in a series, emphasis has always been on obtaining the estimates of the missing values while little or no attention has been given to assessing the effects of the missing values on parameter estimates. The aim of this study therefor...

Open access Research Article 10.9734/acri/2025/v25i41142