Estimation of Wind Speed Statistical Distribution at Vredendal, South Africa

Thapelo C. Mosetlhe, Adedayo A. Yusuff, Yskandar Hamam, and Adisa A. Jimoh


Wind speed, Weibull, Gamma, Lognormal, RMSE, R^2


In this work various statistical methods for estimating the distribution of wind speed at given site are studied and compared. It has always been accepted that Weibull fits the wind speed data better as it has performed well at many sites. This notion is subject to an investigation by comparing Weibull with Rayleigh, Lognormal and Gamma for wind speed. The results of goodness of fit tests using root mean square (RMSE) and coefficient of determination (R^2) showed that Gamma distribution fits the data better than Weibull, Rayleigh and Lognormal.

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