The Total Operating Characteristic (TOC) measures how the ranks of an index variable distinguish between presence and absence in a binary reference variable. Previous methods to generate TOC required data derive from census or simple random sample. However, many researchers apply stratified sampling collect because is more efficient than for applications. Our manuscript derives new methodology ...

In this article, we propose an improved estimator for finite population variance based on stratified sampling by using the auxiliary variable as well rank of variable. Expressions bias and mean square error estimators are derived up to first order approximation. Four real data sets used measure performances estimators. Moreover, a simulation study is also conducted observe efficiency proposed e...

In this paper we investigate the problem of estimation finite population mean using auxiliary information. The aim is to modify a separate ratio estimator by calibration approach for stratified random sampling. We use improve precision estimate parameter incorporating chi-square distance function minimize between original design weight and new weight. two constraints called equations find weigh...

The experiments were conducted for monitoring crop area by spatial sampling methods in a winter wheat main production region with a size of 42Km×42Km in Hengshui City, Hebei Province in China to optimize designs of the frameworks and elements (sample size, sample-square dimension), based on Remote Sensing (RS) and Geographical Information System (GIS) techniques. 5 sample-square dimension level...

abstract: the subject of the life satisfaction is one of the important issues in development economics literature. in this paper, the main determinants of life satisfaction such as economic factors have been considered. for data analysis, the indices of life satisfaction have been collected among 400 people in tehran and neibouring provinces by applying stratified random sampling method. then, ...

This study aims to analyze the relationship between nutritional status, type and duration of contraceptive pills, 1-month injection Depo Medroxy Progesterone Acetate (DMPA) with menstrual disorders in women childbearing age Kupang City. The method used is a quantitative cross-sectional design. sampling technique was simple random stratified sampling. results showed that there status value (P = ...

Genome enabled prediction provides breeders with the means to increase the number of genotypes that can be evaluated for selection. One of the major challenges in genome enabled prediction is how to construct a training set of genotypes from a calibration set that represents the target population of genotypes, where the calibration set is composed of a training and validation set. A random samp...

results: the findings of this mixed methods sequential explanatory study are expected to provide unique information about the health concerns of iranian adolescents and their sources of information, which to date have received little attention. conclusions: these data will provide a rich source of information that can be used by intervention programs, health professionals and policy makers in a...

OBJECTIVE To determine risky behaviors leading to unintentional injuries among Tehrani high school students in 2009. METHODS This cross-sectional study was carried out berween October and December 2009. Out of 237,300 (185151 governmental, 52149 non governmental) Tehrani high school students in both genders, 727 subjects were selected by multistage randomized sampling. Among 20 education dist...