The problem of estimating the variance of the ratio estimator in sampling with probability proportional to aggregate size is investigated. The form of nonnegative unbiased variance estimators is found ...

Sampling is a tool researchers use for marketing, sociology or empirical study. In order for sampling to be productive, the data analysis must not be tainted. There are techniques for creating a ...

PPS （Probability Proportional to Size） sampling method was adopted in purchasing managers’ survey. Using the divisions of the manufacturing or non-manufacturing industry as the selecting strata， the ...

For the estimation of the population total of a character y, defined over a finite population of known size, "optimum" sampling strategies for the case when auxiliary information H of a type commonly ...

The SIZE statement names one and only one size measure variable, which contains the size measures to be used when sampling with probability proportional to size. The SIZE variable must be numeric.

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...