the purpose of this research was to study administrators’ job performance of agricultural secondary education centers in tehran province, from the viewpoint of teachers. this survey study was a descriptive-correlational research. the statistical population of this study included teachers of agricultural secondary education centers of tehran province (n=91) which 46 members were selected using p...

A stratified random sampling method is preferred for selecting varied populations with outliers. As opposed to plain sampling, increases statistical precision by reducing estimator variance. Before the estimator's variance, stratum boundary identification and data apportionment must be solved. In this study, a Neyman allocation strategy used address determination issue in mixed populations. add...

the aim of the present research was to study the impact of organizational culture on entrepreneurial orientation given the mediating role of knowledge management. the statistical population consisted of the employees of district 1 and 2 municipalities of qazvin who were about 200 in number, of whom 130 people were selected based on stratified random sampling method and cochran formula. data ana...

Shyness and loneliness both are very common in human being. Loneliness is often associated with a variety of personality characteristics which interfere with the formation of interpersonal relationship. In many studies it is found that shyness and loneliness are interrelated with each other. The present study was conducted on college students. The sample size consists of 60 college students (30...

PracTools is an R package with functions that compute sample sizes for various types of finite population sampling designs when totals or means are estimated. One-, two-, and three-stage designs are covered as well as allocations for stratified sampling and probability proportional to size sampling. Sample allocations can be computed that minimize the variance of an estimator subject to a budge...

present study aimed to investigate the effect of cultural and emotional intelligence on performance of county employees working in tehran considering the mediator role of cross cultural adaptation. this study is a descriptive research. the study sample consists of managers (120) and county employees (700) working in private companies in the computer industry and mobile, given the limited number...

The precision of parameters estimation are determined by the sample size and the sampling design used in a study. Due to such practical constraints as the budget and manpower, most large-scale educational studies would not adopt the simple random sampling design. TIMSS 2007 used a two-stage stratified cluster sampling design. In the first stage, about 150 schools were selected according to some...

Stratified sampling is a sampling method that takes into account the existence of disjoint groups within a population and produces samples where the proportion of these groups is maintained. In single-label classification tasks, groups are differentiated based on the value of the target variable. In multi-label learning tasks, however, where there are multiple target variables, it is not clear ...

We have developed a new technique to characterize the multi-line emission from molecular clouds using statistical sampling. Our method uses available extinction maps select relatively small sample of cloud positions that cover full range column densities in cloud, and can be observed with only modest investment telescope time. Here we present first results applying this Perseus nearby star-form...

Through the monitoring network for cultivated land quality in county area, distribution and changing trend of the quality should be reflected. Besides, the quality of non-sampled locations should also be estimated with the data of sampling points. Due to the correlation among spatial samples, traditional methods such as simple random sampling, stratified sampling and systematic sampling are ine...