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

The method of systematic random sampling (METHOD=SYS) selects units at a fixed interval throughout the sampling frame or stratum after a random start. PROC SURVEYSELECT chooses the first unit randomly ...

Ke Won Kang, Jon P. Lindemann, Joe C. Christian, Walter E. Nance and James A. Norton jr. The sampling variances in twin and sibling studies of man for estimation of intraclass correlation coefficients ...

Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...