background: the association of duration of breastfeeding (bf)  with  weight disorders remains controversial.  this study aimed to evaluate the association of bf with anthropometric measures and weight disorders in iranian children and adolescents. materials and methods: using multistage random cluster sampling method, a representative sample of 25,000 school students were selected from urban an...

The study was carried out to analyse the economics of shifting land from field crops hog plum cultivation in southern Bangladesh during July September 2018. A total 120 farmers were selected by using multistage stratified random sampling technique collect primary data. Result shows that per hectare average cost Tk. 94,126. yield 7.97 t ha-1. Net return 126,921 hectare. By cultivating plum, obta...

the purpose of this study was to investigate the empowerment indices in sport coaches in urmia. this research was a survey and a field study. multistage random sampling was used. the data were gathered by a standard questionnaire of empowerment index evaluation (d. scott & t. jaffe): the reliability = 94.2% and validity = 90.5%. the sample included 155 male and female sport coaches who were sel...

background the prevalence of childhood obesity is increasing worldwide and is one of the most serious public health challenges of the 21st century. obesity during childhood can be harmful to the body. objectives this study aimed to determine the prevalence of overweight and obesity among schoolchildren in semnan province, iran. patients and methods in this cross-sectional study, 2195 schoolchil...

This study was aimed at describing the mediating role of resiliency in the relationship between family functioning and mental health in patients with type 2 diabetes mellitus. This descriptive research was a correlational study. A total of 225 individuals were chosen by simple random sampling technique from type 2 diabetic patients presented to diabetes care centers in Kermanshah in 2014 in Ira...

Applied statistics research plays pivotal role in diverse problems of social sciences, agricultural sciences, health sciences, and business research. Many investigations are conducted by survey research. The technique of sampling and determination of sample size have crucial role in survey-based research problems in applied statistics. Specific sampling techniques are used for specific research...

BACKGROUND Abortions are of major public health concern in developing countries. In settings in which abortion is highly prohibited, the direct interview is not a reliable method to estimate the abortion rate. The indirect estimation methods to measure the rate of abortion might overcome this dilemma; They are practical methods to estimate the size of the hidden group who do not agree to partic...

We recently applied a multistage reweighting scheme to demonstrate the sampling of equilibrium configurational distributions of peptides from nonequilibrium, simulated annealing trajectories [E. Lyman and D. M. Zuckerman, J. Chem. Phys. 127, 065101 (2007)]. Here we demonstrate that a statistical variance reduction technique, resampling, improves the efficiency of the protocol by about a factor ...