Testing Heteroscedasticity in Nonparametric Regression Based on Trend Analysis

Shen, Si-Lian; Cui, Jian-Ling; Wang, Chunwei

doi:10.1155/2014/435925

Cited by 3 publications

(2 citation statements)

References 14 publications

(23 reference statements)

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“…Uji Autokorelasi bertujuan untuk menguji apakah terdapat korelasi antara kesalahan pengganggu pada periode t dengan periode t-1 atau sebelumnya didalam model regresi (Chen, 2016;Ke & Zhang, 2018) Hal tersebut dapat dilihat melalui nilai residual (prediction error) dari uji Durbin-Watson (Durbin & Watson, 1950;Vinod, 1973) Apabila uji DW menunjukkan angka -2< dw <2 maka tidak terjadi autokorelasi (Gujarati et al, 2010). Uji heteroskedastisitas bertujuan untuk mengetahui apakah dalam suatu model regresi terdapat perbedaan atau persamaan varians dari residual satu pengamatan ke pengamatan yang lain (Carapeto & Holt, 2003;Shen, Cui, & Wang, 2014). Jika titiktitik berpola teratur pada grafik scatterplot bergelombang dan menyempit mengindikasikan adanya heteroskedastisitas sedangkan pada titik-titik yang tidak berpola dan menyebar diatas dan dibawah angka 0 pada sumbu Y mengindikasikan tidak terjadi heteroskedastisitas (Ghozali, 2006).…”

Section: Metode Penelitianunclassified

Analisis Efisiensi Penggunaan Faktor-Faktor Produksi Usahatani Cabai Rawit Di Desa Girikulon Kecamatan Secang Kabupaten Magelang

Maemunah

Setiadi

2019

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The research aimed to analyze the effect of the use of production factors such as land, seed, manure, ZA fertilizer, TSP fertilizer, KCL fertilizer and pesticide and to analyze the economic and technical efficiency of factors affecting chili farming in Girikulon village, Secang district, Magelang regency. The method used in this research was survey. The research was conducted in January-February 2019 in Girikulon Village, Secang District, Magelang regency. The location of the research was selected purposively. Samples were taken using a probability sampling technique on 33 farmers who exclusively practiced monoculture chili cultivation. Data was analyzed using multiple linear regression analysis method transformed into the Cobb-Douglas model production function and analysis of technical efficiency and economic. The economic efficiency tested employed a different sample analysis (one sample T test). The results showed that the use of production factors i.e. land, seed, labor, manure, ZA fertilizer and pesticide simultaneously had significant effect on the yields while the other factors such as TSP and KCL fertilizer had no significant effect on the yield. The use of land, KCL fertilizer and pesticide was technically and economically not efficient. Keywords: Chili, Efficiency and Factors Of Production.

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Section: Metode Penelitianunclassified

Analisis Efisiensi Penggunaan Faktor-Faktor Produksi Usahatani Cabai Rawit Di Desa Girikulon Kecamatan Secang Kabupaten Magelang

Maemunah

Setiadi

2019

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“…First, the regression analysis [27][28][29][30][31][32][33][34][35] was performed on lny, lnx 1 , x 2 , x 3 , x 4 , the residual sequence of the equation, named E, was tested for unit root stationarity for E, and the results are shown in Figure 2.…”

Section: Model Setting and Calculationmentioning

confidence: 99%

The Influence of Demographic Factors on Urban Medical Insurance Expenditure under Big Data

2022

Mathematical Problems in Engineering

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As the urban basic medical insurance with the most widespread area and age coverage, a series of research is conducive to the optimization and better promotion of policies. As the main receptor of medical insurance, people analyze the impact of population factors on the expenditure of urban basic medical insurance, which is conducive to the improvement and implementation of the medical insurance system. In this paper, birth rate, total dependency ratio, urban population proportion, and educational population proportion were selected as independent variables, urban basic medical insurance expenditure was selected as dependent variables, and a regression model was established after data processing and analysis. The results show that the birth rate, the proportion of the urban population, and the expenditure of the urban basic medical insurance fund will change in the opposite direction; the expenditure of the urban basic medical insurance fund, the total dependency ratio, and the illiteracy rate will change in the same direction.

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The dominant role of heavy precipitation in precipitation change despite opposite trends in west and east of northern China

Song

Chen

et al. 2015

Intl Journal of Climatology

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Based on daily precipitation measurements from 271 meteorological stations in northern China during 1960–2011, we found that precipitation amount did not show significant trend (p = 0.25). To obtain a better understanding of regional precipitation differences, we divided northern China into two regions and five sub‐regions. A wetting tendency was identified for the northwestern of China (NW), while a drying tendency was determined for the northeastern of China (NE). Precipitation tendencies also displayed regional differences. We determined that changes in precipitation frequency dominated changes in precipitation amount for low altitude areas, while changes in precipitation intensity were the main cause of changes in precipitation amount in high altitude areas. Both precipitation frequency and intensity had an equivalent impact on changes within middle altitude regions of the NW. In contrast, changes in precipitation amount within the NE were mainly caused by precipitation frequency. The effect of precipitation intensity on precipitation amount was not significant. For all of the sub‐regions investigated, heavy precipitation contributed the most to changes in total precipitation amount. The results obtained from this study will be of value to those studying the response of northern Chinese ecosystems to climate change.

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Testing Heteroscedasticity in Nonparametric Regression Based on Trend Analysis

Cited by 3 publications

References 14 publications

Analisis Efisiensi Penggunaan Faktor-Faktor Produksi Usahatani Cabai Rawit Di Desa Girikulon Kecamatan Secang Kabupaten Magelang

Analisis Efisiensi Penggunaan Faktor-Faktor Produksi Usahatani Cabai Rawit Di Desa Girikulon Kecamatan Secang Kabupaten Magelang

The Influence of Demographic Factors on Urban Medical Insurance Expenditure under Big Data

The dominant role of heavy precipitation in precipitation change despite opposite trends in west and east of northern China

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