BACKGROUND Missing data on tumour stage information is a common problem in population-based cancer registries. Statistical analyses on the level of tumour stage may be biased, if no adequate method for handling of missing data is applied. In order to determine a useful way to treat missing data on tumour stage, we examined different imputation models for multiple imputation with chained equatio...

Compressed sensing and magnetic resonance imaging are hot topics in the field of signal processing. In this study we introduced in Lustig’s variable density sampling method, integrated it to compressed sensing, and applied it to brain MRI acquisition. The realistic experiment shows the variable density sampling recovery better than traditional random sampling method on a 256x256 brain magnetic ...

the present study seeks to describe the acceptance rate of gender-related stereotypes (grs) by young males and females. it also analyses the impact of socio-familial factors on acceptance rate. the study was conducted through a survey method. 425 young males and females (out of 10944) who were under training in the vocational training centers in the mazandaran province were selected randomly by...

 The aim of this research was to develop a retirement management model in the Workers' Refah Bank. In terms of its purpose, the method is a combination of the phenomenological method in the quantitative part and descriptive-correlation method, in the quantitative part of research. The statistical population of the research in the qualitative section has been 39 people including: close-to-retire...

In two-stage cluster surveys, the traditional method used in second-stage sampling (in which the first household in a cluster is selected) is time-consuming and may result in biased estimates of the indicator of interest. Firstly, a random direction from the center of the cluster is selected, usually by spinning a pen. The houses along that direction are then counted out to the boundary of the ...

introduction: breast feeding is universally and traditionally practicised in india. experts advocate breast feeding as the best method of feeding young infants. objective: to assess the role of various factors in determining colostrum feeding in block r. s. pura of district jammu. materials and methods: a stratified two-stage design with villages as the primary sampling unit and lactating mothe...

The municipality of Ath is characterised by the presence, in its center, of two non-ferrous metal industries whose emissions make local residents concerned for their health. Therefore, authorities of the Walloon Region and the municipality of Ath undertook biomonitoring to assess the impact of those industrial emissions on heavy metal body burden in humans.This paper describes the study design ...

Flow-stratified sampling is a new method for sampling water quality constituents such as suspended sediment to estimate loads. As with selection-at-list-time (SALT) and time-stratified sampling, flow-stratified sampling is a statistical method requiring random sampling, and yielding unbiased estimates of load and variance. It can be used to estimate event yields or to estimate mean concentratio...

This paper develops an optimization model for the diffusion effects of free samples under dynamic changes in potential market based on the characteristics of independent product and presents a two-stage method to figure out the sampling level. The impact analysis of the key factors on the sampling level shows that the increase of the external coefficient or internal coefficient has a negative i...

this article studies emotional divorce and the sociological factors effective on it in the city of tehran. the statistical population of the research includes all the families residing in the city of tehran and the sampling methodology is two-stage random and cluster sampling method. the theoretical framework of the research is a combination of the theory of structural functionalism and the the...