Variance is a measurement of the spread between numbers in a data set. Investors use the variance equation to evaluate a portfolio’s asset allocation.

Richard Valliant, Generalized Variance Functions in Stratified Two-Stage Sampling, Journal of the American Statistical Association, Vol. 82, No. 398 (Jun., 1987), pp. 499-508 ...

This paper gives alternative derivations for the standard variance formulas in two-stage sampling. The derivations are based on a direct use of the statistical properties of the sampling errors in the ...

In particular, two-dimensional extensions of known approximate variance estimators used in linear systematic sampling are introduced. These almost new variance estimators have the advantage of taking ...

Overview: What Is Homogeneity of Variance? Starting with the premise that you have independent and random groups of continuous data, you may use that data to answer several different statistical ...