The wind is one of the most important and studied variables globally, essential to several sectors, for example, energy. Therefore, this study assesses regime analysis trends in three locations within Paraná state, Brazil. historical series were recorded between 1976 2010 at conventional meteorological stations belonging Brazilian National Institute Meteorology. WRPLOT version 8.0.0 software wa...

Hydrological drought is defined by long-term decrease in levels and flows of water bodies. The task of this paper is to analyze and identify statistical trends of low flows in streams in the eastern Slovakia. Methodology for evaluating hydrological drought is based on statistical analysis of observed low stream flows at chosen river stations – annual and seasonal. Mann-Kendall statistical test ...

This paper presents a novel framework to determine the number of resolution levels in the application of a wavelet transformation to a rainfall time series. The rainfall time series are decomposed using the à trous wavelet transform. Then, multi-scale entropy (MSE) analysis that helps to elucidate some hidden characteristics of the original rainfall time series is applied to the decomposed rain...

Purpose. To carry out the surface water quality assessment of Southern Bug river basin and to investigate ability self-purify. Methods. Statistical calculations, system analysis. Results. The long-term dynamic integrated index values during 2000-2016 was heterogeneous, but general trend indicated a slight increase due sanitary-ecological pollution index. highest level observed in Khmelnytsky ci...

In this paper, the variation of temperature and rainfall at Patna are analysed using simple non-parametric tests. The trends in annual maximum minimum daily temperatures, rainfall, number rainy days a year, average per day ratio to have been examined. Tends total monthly Highest month also determined for every year. data Mann-Kendall test indicated statistically significant changes pattern city.

Understanding complex relationships between random variables is of fundamental importance in high-dimensional statistics, with numerous applications in biological and social sciences. Undirected graphical models are often used to represent dependencies between random variables, where an edge between to random variables is drawn if they are conditionally dependent given all the other measured va...

An upward trend in Ontario tornado frequency (about 1.6 tornadoes/decade with the statistically significant level at least at 95%) is identified using three independent approaches. The first method is the conventional linear regression method that had no disturbance to the original tornado time series. The second approach is to employ the Mann-Kendall test with consideration of removing a lag o...