Application of criteria for testing homogeneity of distribution laws

Lemeshko, B. Yu.; Lemeshko, S. B.; Veretelnikova, Irina

doi:10.17223/19988605/41/3

Cited by 3 publications

(2 citation statements)

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“…Hydrological regime shift (change) point detection for annual and seasonal water flow. The time boundaries between individual long phases of increased and decreased values of annual and seasonal water flow were determined using normalized cumulative deviation curves (Andreyanov 1959;Georgiadi et al 2018) in combination with the statistical homogeneity of the average values of the series using the Student t-test (Stepanek 2008;Lemeshko et al 2018) and Mann-Whitney-Pettitt (MWP) test (Pettitt 1979) in the AnClim software for analysis time series. The estimates of the shift points of the contrasting phases, determined by different methods, mostly coincided with the conclusions made earlier for Russian rivers (Georgiadi et al 2018).…”

Section: Methodsmentioning

confidence: 99%

“…It is a commonly used test primarily because it is distribution-free and insensitive to outliers and skewness in the data (Hedberg 2015;Yeh et al 2015;Sharma and Singh 2017). The well-known Student's t-test is a parametric test based on a comparison of the mean values of two samples with unknown but equal variances (Lemeshko et al 2018). This equality is confirmed by the results of Fisher criterion calculations for most characteristics considered in this paper for the rivers under study.…”

Section: Methodsmentioning

confidence: 99%

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Water Flow Changes In The Don River (European Russia) During 1891–2019

Георгиади

Milyukova

Borodin

et al. 2023

GES

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The Don River Long near Razdorskaya Village had long phases (lasting 33–86 years) of increased/decreased naturalized annual and seasonal water flow, and their properties for 1891–2019 were identified. Long-term changes in the annual and snow-melt flood flow occurred in the opposite phase relative to changes in the winter and summer-autumn flow. Annual hydrographs in the phase of decreased flow were characterized by an increase in water discharge during the low-water seasons of the year, but a noticeable decrease in daily flood water discharge and maximum water discharge. The share of high-water years (years with a flow exceedance probability equal to or less than 25%) in the phase of increased flow is significantly higher than the share of low-water years (years with a flow exceedance probability equal to or more than 75%). And on the contrary. At the same time the cumulative share of low- and high-water years remains relatively stable. The total changes in the annual and seasonal flow, caused by both anthropogenic and climatic factors, throughout the entire period of modern global warming (since 1989) consisted in a decrease of the annual and snow-melt flood flow and an increase of flow values during low-water seasons.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Water Flow Changes In The Don River (European Russia) During 1891–2019

Георгиади

Milyukova

Borodin

et al. 2023

GES

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Perceptions Of Villagers On Environmental Development Of Rural China In The Context Of Rapid Urbanization

Zhao

Shen

Haiying

et al. 2023

GES

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. In the context of rapid urbanization, pollution and ecological degradation problems have frequently shown up and influenced environmental sustainability of rural China in the past decades. The rural residents have begun to pay attention to local environment protection, and researchers have been taking public perceptions into regional planning. However, comprehensive studies on the perceptions of villagers on rural environment development still remain less. This research carried out a face-to-face questionnaire investigation of 187 villages and ten residents from each village at a nationwide scale of China. The investigated village committee managers and residents were interviewed by asking the questions including the existing environmental problems, the targets of rural environment development, the ways to achieve these targets and the willingness to pay for pollution control. The results showed that household waste pollution, air pollution and pesticides pollution etc. are top concerned problems. A big proportion (65%) of the interviewed residents chose “environment with good quality for health” as their preferred living environment. While, more than half of the interviewed village managers took “green villages with sustainable agriculture” as their village development targets. And more than 50% of the interviewed residents advocated to increase the forest coverage rate to mitigate the degeneration of rural ecosystem services. As well, most residents strongly support rural green development and are willing to pay for pollution control. Our findings may provide new insights into rural environment development and rural revitalization in the context of rapid urbanization.

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Spatial variations of the hummocks keel draft in the Laptev Sea area

Naumov

Skutina

Yakimushkin

2022

Problemy Arktiki i Antarktiki

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The article investigates the morphometric features of the ice cover lower surface in the Laptev Sea area. The main attention is paid to the study of the hummocked formations’ keel draft and the spatial variability of this quantity. The data for the research were obtained during several ice seasons (from two to four) in the period 2014-2019 using upward-looking sonars, which were part of the submerged autonomous buoy stations (SABS). The stations were installed at five points in the Laptev Sea area. The data obtained from a series of observations of the ice cover draft allowed extracting information on the hummocked formations’ keel draft at separate points of the sea area. As a result, samples of values of the hummocks keel draft were formed for separate ice seasons for each of the five stations. Further, a statistical processing of the data obtained was performed. In particular, for each of the ice seasons we checked the homogeneity of the mean values and of the distribution of samples by stations. Also checked was the distribution matching. A comparative data analysis using methods of mathematical statistics made it possible to describe the spatial variability of the hummocked formations’ keel draft in the Laptev Sea area for separate ice seasons. The “key” points (stations) describing the spatial variability of the hummocked formations’ keel draft for all the ice seasons considered were determined according to the results of the analysis performed, which allows planning further ice draft research using SABS, if required (to determine the necessary number of stations and points of their installation).

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Application of criteria for testing homogeneity of distribution laws

Cited by 3 publications

References 0 publications

Water Flow Changes In The Don River (European Russia) During 1891–2019

Water Flow Changes In The Don River (European Russia) During 1891–2019

Perceptions Of Villagers On Environmental Development Of Rural China In The Context Of Rapid Urbanization

Spatial variations of the hummocks keel draft in the Laptev Sea area

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