Impact Factor (2025): 6.9
DOI Prefix: 10.47001/IRJIET
In other to
improve the ability of decision-makers to prepare for and deal with the
unforeseen circumstances resulting from climate change as consequences of
precipitation fluctuations, extreme and torrential rainfall. It is important to
provide a more complete understanding of the range and likelihood of rainfall
patterns a location could receive using a probabilistic model whose parameters might
complement or even replace such common measures as the mean, median, variance,
minimum, maximum and quartile values as major descriptors
of rainfall at such location. Daily precipitation totals can be approximated by
the gamma distribution as it is bounded on the left at zero and positively
skewed indicating an extended tail to the right which suit the distribution of
daily rainfall and accommodate the lower limit of zero which constrains
rainfall values. This paper presents the comparison between Maximum Likelihood
Estimation (MLE) of closed & open form solutions and Method of Moment
Estimation (MME) of location and scaling parameters of the two-parameter gamma
distribution, the parameters were estimated using MME and MLE with their
performance adjudged and the result obtained showed that the closed-form
solution of the MLE outperformed the open form solution and MME by comparing
their estimates for the scaling parameter.
Country : Nigeria
IRJIET, Volume 7, Issue 2, February 2023 pp. 69-79