Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Gordon Scott has been an active investor and technical analyst or 20+ years. He ...

The purpose of this note is to propose a variance estimator under non-measurable designs that exploits the existence of an auxiliary variable well correlated with the survey variable of interest.

Systematic sampling, the classical approach to the estimation of areas by point-counting techniques, is compared to stratified random sampling and to systematic sampling with multiple random starts.