Statistical Uncertainty in Hydrometeorological Trend Analyses

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dc.contributor.authorOnyutha, Charles
dc.date.accessioned2022-09-17T17:47:23Z
dc.date.available2022-09-17T17:47:23Z
dc.date.issued2016
dc.description.abstractThis study demonstrates the existence of uncertainty in hydrometeorological trend analyses using historical rainfall from Kenya in East Africa. With respect to the influence of short- and long-term persistence on trend analyses, a total of 13 approaches of rank-based techniques including Mann-Kendall, Spearman’s Rho, and Cumulative Rank Difference (CRD) tests were employed. Graphically, CRD-based diagnoses of trends and subtrends were performed. To assess data-related uncertainty, a resampling procedure was applied. It was shown that at a selected significance level, the null hypothesis𝐻0 (no trend) can be rejected for trend direction while the evidence to reject 𝐻0 (zero trend magnitude) is statistically insufficient. Graphical and statistical approaches when combined yield more influential and comprehensive information for inference than relying purely on statistical results. Alongside an apparent linear trend, variations in the nonlinear (e.g., cyclical) component of the series may also not be due to natural randomness. Method-related uncertainty is not negligible especially for series with persistent fluctuations.These findings shed light on the need to assess uncertainty on trend results. Furthermore, it is recommended that the conclusiveness of trends be cautiously premised not only on statistical grounds but also on more considered physical and/or theoretical understanding of the hydrometeorological processes.en_US
dc.identifier.citationOnyutha, C. (2016). Statistical uncertainty in hydrometeorological trend analyses. Advances in Meteorology, 2016. http://dx.doi.org/10.1155/2016/8701617en_US
dc.identifier.urihttp://dx.doi.org/10.1155/2016/8701617
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/4792
dc.language.isoenen_US
dc.publisherAdvances in Meteorologyen_US
dc.subjectHydrometeorologicalen_US
dc.subjectTrend analysisen_US
dc.titleStatistical Uncertainty in Hydrometeorological Trend Analysesen_US
dc.typeArticleen_US
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