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.

To this end, we provide a theoretical characterization of the statistical properties of two popular estimators in MR: the inverse-variance weighted (IVW) estimator and the IVW estimator with screened ...

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 ...