Análise de tendência em séries históricas de vazão e precipitação: uso de teste estatístico não paramétrico

Uliana, Eduardo Morgan; Silva, Demétrius David da; Uliana, Estevão Morgan; Rodrigues, Beatriz Silveira; Corrêdo, Lucas de Paula

doi:10.4136/ambi-agua.1427

Cited by 13 publications

(13 citation statements)

References 7 publications

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“…Com a finalidade de proceder o estudo da comparação do valor da EEH entre os pacientes que realizam hemodiálise e diálise peritoneal, foi aplicado o teste de Mann-Whitney. Este é um teste não paramétrico, o qual confere se duas amostras distintas pertencem à mesma população (15) . Foram considerados estatisticamente significantes os valores de p inferiores a 0,05.…”

Section: Métodounclassified

Perfil E Nível De Esperança Entre Pacientes Que Realizam Hemodiálise E Diálise Peritoneal

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Borges

2020

Cogit. Enferm.

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Objetivo: identificar o perfil clínico, psicossocial e mensurar o nível de esperança entre pacientesque realizam hemodiálise e diálise peritoneal.Método: estudo exploratório, descritivo e quantitativo, realizado numa unidade de nefrologiado Distrito Federal com pacientes em tratamento dialítico. A coleta aconteceu entre setembro eoutubro de 2018, com questionário de caracterização e aplicação da escala de esperança de Herth.Para comparar o nível de esperança, utilizou-se o teste de Mann-Whitney.Resultados: participaram 122 pacientes. O escore médio de esperança obtido foi de 39,79 (±5,3)com maior nível em 48 e, no teste comparativo, não houve diferença significativa entre os níveis deesperança.Conclusão: apesar de todas as limitações impostas pelo tratamento e doença, essa populaçãopossui bom nível de esperança. Este estudo contribuiu para a ampliação do debate acadêmicoque permitiu identificar e construir pontos essenciais para um bom planejamento dos cuidados deenfermagem, em especial no âmbito do tratamento da doença renal crônica.

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Section: Métodounclassified

Perfil E Nível De Esperança Entre Pacientes Que Realizam Hemodiálise E Diálise Peritoneal

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Borges

2020

Cogit. Enferm.

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“…The authors verified a strong connection in relation to the type of use and withdraw of water resources for the station whose analyzes showed a negative trend in all series. Uliana et al (2015) studied trends in time series of rainfall and flow data for the city of Alegre, in the state of Espirito Santo, Brazil, and found that flow rate in October had increased by 34.2% since 1963. They also detected a tendency of increase in rainfall for the months of August and September, since the years of 1967 and 1964, respectively, and concluded that this trend, among other possible factors, may have influenced the increase of the average flow rate for the month of October.…”

Section: Trend Analysismentioning

confidence: 99%

“…Climatic variability and disorderly use of the soil affect several components of the hydrological cycle, impacting the pattern of time series (Salvadori, 2013;Damázio and Costa, 2014;Tan and Gan, 2015;Agevap, 2016). Statistical tests such as Pettitt and Mann-Kendall can be applied to trend analysis in the time series of meteorological and hydrological variables (Barua et al, 2013;Uliana et al, 2015). The Mann-Kendall test (MK) is recommended by the World Meteorological Organization (WMO) and widely applied (Blain, 2010;Caloiero et al, 2011;Lima et al, 2011;Suhaila et al, 2010;Tao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Flow distribution and trends in the Das Velhas River Basin

Melo¹,

Júnior²,

Silva³

2019

Rev. ambiente água

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In the management of water resources, it is necessary to balance the demands of multiple uses of water and water availability, while enabling use in an environmentally sustainable way. Probability distributions of flow rates are essential tools for assessing water availability. The objectives of this work were to analyze the best probability distribution that conforms to the annual minimum daily average discharge for periods of seven consecutive days (Q7) for 14 stream gauging stations in the Das Velhas River Basin and to identify possible trends in Q7 time series and in bi monthly and annual sets of daily discharges in three key stream gauging stations. The quality of fit was verified by the Anderson-Darling test (A-D). The selection of the models that presented the best fit was done according to the Bayesian Information Criterion (BIC). The Mann-Kendall test was used to verify trends in time series of discharge. In general, better measures of quality of fit were obtained for the probability distributions Gumbel and Rayleigh. Negative trends in discharge distributions were verified in the three stations. For the Várzea da Palma station, the closest to the river mouth, negative and significant trends were found for the Q7 data and daily average discharge for every bimester except the first.

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“…The Pettitt test, also used to verify the stationary of the data, allows, in the case of series that do not present stationery, to identify the period in years of the change occurred. This test is a version of the Mann-Whitney statistic Ut, N, applied to verify if two samples x1, ..., xt and xt + 1, xn belong to the same population, the test statistic Ut, N obtained through Equation 4 (Uliana et al, 2015).…”

Section: Stationary Analysis Of Streamflow and Rain Datasetmentioning

confidence: 99%

Nonparametric tests for stationary analysis in hydrological data

Aires

Reis

Campos

2019

J. Env. Anal. Progr.

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One of the main problems for water resources management systems has been the climate change and the intensification of anthropogenic activities in river basins. In this context, this work aimed to analyze the dynamics of land use and cover and its influence on temporal variability on streamflow data. The behavior of hydrological data (streamflow and rainfall) over time was analyzed by applying the nonparametric tests of Mann Kendall and Pettitt. Images derived from orbital sensors using the Random Forest classifier assessed the anthropogenic influence in the area, land use, and cover classification. The rainfall data did not present significant changes over time, according to the applied tests. However, the low annual flow and average annual flow presented nonstationary behavior, with a trend of reduction over time. As rainfall did not change in its patterns over time, the main reason associated with the changes in streamflow regimes was associated with the changes in land use and land cover, especially in the areas for crops, that had an increase of 48% in the study period, which can contribute to increase the demand for water and affect the streamflow. The results obtained confirm the importance of this study for water management systems to adapt itself to the changes in hydrological behavior over time.

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Análise de tendência em séries históricas de vazão e precipitação: uso de teste estatístico não paramétrico

Cited by 13 publications

References 7 publications

Perfil E Nível De Esperança Entre Pacientes Que Realizam Hemodiálise E Diálise Peritoneal

Perfil E Nível De Esperança Entre Pacientes Que Realizam Hemodiálise E Diálise Peritoneal

Flow distribution and trends in the Das Velhas River Basin

Nonparametric tests for stationary analysis in hydrological data

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