Sosyal Hizmetler Bölümü Koleksiyonu
https://hdl.handle.net/20.500.12440/243
2024-03-28T21:45:27Z
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A general class of improved population variance estimators under non-sampling errors using calibrated weights in stratified sampling
https://hdl.handle.net/20.500.12440/6157
A general class of improved population variance estimators under non-sampling errors using calibrated weights in stratified sampling
M K Pandey; G N Singh; Tolga Zaman; Aned Al Mutairi; Manahil SidAhmed Mustafa
This paper proposes a new calibration estimator for population variance within a stratified two-phase sampling design. It takes into account random non-response and measurement errors, specifically applying this method to estimate the variance in Gas turbine exhaust pressure data. The study integrates additional information from two highly positively correlated auxiliary variables to develop a general class of estimators tailored for the stratified two-phase sampling scheme. The properties of these estimators, in terms of their biases and mean square errors, have been thoroughly examined and extensively analyzed through numerical and simulation studies. Furthermore, the calibrated weights of the strata are derived. The proposed estimators outperform the natural estimator of population variance. Finally, suitable recommendations have been made for survey statisticians intending to apply these findings to real-life problems.
2024-01-01T00:00:00Z
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An efficient Hartley–Ross type estimators of nonsensitive and sensitive variables using robust regression methods in sample surveys
https://hdl.handle.net/20.500.12440/6088
An efficient Hartley–Ross type estimators of nonsensitive and sensitive variables using robust regression methods in sample surveys
Zaman, Tolga; Shazad, Usman; Yadav, Vinay Kumar
In sample surveys, the problem of outliers is one of the most frequent and widest, whose solution is required to be obtained using statistical techniques. To overcome this problem, various robust regression methods are being developed such as LTS, LMS, LAD, Huber-M, Hample-M, Tukey-M and Huber-MM methods. This article presents the modified Hartley–Ross type ratio estimators to estimate the population mean in sample surveys. The proposed design is taken into account under the two suppositions one is that the study variable is a non-sensitive variable, which means that measurements on it do not embarrass participants in personal interviews and other is the sensitive variable, which means that measurement errors are introduced as a result of a few dishonest responses. The use of scrambling response models helps to reduce these measurement errors to some extent. The proposed estimator is found to be more efficient than the existing classical estimators. A Numerical illustration was performed on a real data set in R-Program Software to support of our findings. © 2023 Elsevier B.V.
2023-01-01T00:00:00Z
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Gender moderates the relationships between childhood abuse experiences and mental disorders later in life: a cross-sectional study among university students in Turkey
https://hdl.handle.net/20.500.12440/6072
Gender moderates the relationships between childhood abuse experiences and mental disorders later in life: a cross-sectional study among university students in Turkey
Türkkan, Tuğba; Odacı, Hatice; Bülbül, Kenan
This study aimed to assess the moderating role of gender in the relationship between childhood abuse and mental disorders in the population of a country that has been little studied. This research was designed by the correlational model, one of the quantitative research designs. 272 university students attending a state university in Turkey participated in the research. For sample selection, the convenience sampling method was used. As a result of analyses within the scope of the present study, it was concluded that gender had a moderating effect on the relationship between sexual abuse and somatisation, emotional abuse and negative self and physical neglect and hostility. This finding may help clinicians and researchers in providing optimal health services. © 2023 Informa UK Limited, trading as Taylor & Francis Group.
2023-01-01T00:00:00Z
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Do psychological resilience and life satisfaction affect happiness levels of individuals? A case study for Trabzon University
https://hdl.handle.net/20.500.12440/5724
Do psychological resilience and life satisfaction affect happiness levels of individuals? A case study for Trabzon University
Turkkan, Tugba; Bulbul, Kenan; Odaci, Hatice
The aim of the research is to examine the effect of psychological resilience and life satisfaction on happiness. Accordingly, the research included students from different departments of Trabzon University in the spring semester of the 2018-2019 educational year and was completed with 558 students who accepted participation. Within the scope of the study, the demographic information form, Brief Resilience Scale, Satisfaction with Life Scale and Oxford Happiness Questionnaire-short form were used. As a result of the analyses, the happiness levels of students did not differ statistically significantly based on their gender and income levels, but differed statistically significantly based on department they studied and this difference was due to students attending the department of foreign languages education. Finally, according to multiple regression analysis, life satisfaction alone predicted 43% of happiness level, while including psychological resilience was included in the model, they both predicted 50%.
2022-01-01T00:00:00Z