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- 저자 : Kadilar, Cem (검색결과 2 건)
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Robust ratio-type estimators in simple random sampling
Evrim Oral,Cem Kadilar 한국통계학회 2011 Journal of the Korean Statistical Society Vol.40 No.4
In sampling theory, ratio-type estimators are extensively used to estimate the population mean when the correlation between study and auxiliary variables is positively high. In this study, we incorporate robust modified maximum likelihood estimators (MMLEs)into Kadilar–Cingi estimators and provide their properties theoretically. We support the theoretical results with simulations under numerous super-population models, and study the robustness properties of these modified estimators. We show that utilization of MMLEs in estimating the mean of a finite population leads to robust estimates, which is very advantageous when we have non-normality or other common data anomalies such as outliers.
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Emri, Salih,Kilickap, Saadettin,Kadilar, Cem,Halil, Meltem Gulhan,Akay, Hadi,Besler, Tanju Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7
The aim of this study was to investigate the possible relationship between antioxidant vitamin levels and malignant pleural mesothelioma (MPM). For this purpose, we measured the serum levels of 4 antioxidant vitamins, ${\beta}$-carotene, ${\alpha}$-tocopherol, retinol, and ascorbic acid, in patients with environmentally induced MPM and in healthy controls from one tremolite village (Kureysler), the biggest erionite village (Tuzkoy) and Ankara. A total of 160 subjects were enrolled in the study, 42 (26.3%) diagnosed with MPM and 118 (73.7%) healthy subjects. A comparison was made between the MPM group and three control groups of which two were exposed and one was unexposed to mineral fibers. The study population consisted of 82 males (51%) and 78 females (49%) with a mean of age of $44.8{\pm}14$ years (range; 20-65 years). Lowest levels of ${\beta}$-carotene, ascorbic acid, and ${\alpha}$-tocopherol were found in MPM patients (MPM vs control groups combined, p<0.0001 for each antioxidant vitamin), without any relation to age or sex. There was no significant difference between the antioxidant levels of healthy controls of Tuzkoy and Ankara. In conclusion; our findings suggested an increased risk of MPM being associated with low levels of ${\alpha}$-tocopherol and ascorbic acid in patients with MPM.
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