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.

Bray, D F, Bell, A E, and King, S C. 1962. The importance of genotype by environment interactions with reference to control populations. Genet Res, 3, 282–302. Clayton, G A, Morris, J A, and Robertson ...

Unit nonresponse and item nonresponse both occur frequently in surveys. Unit nonresponse is customarily handled by weighting adjustment, whereas item nonresponse is usually treated by some form of ...

Many techniques in survey sampling depend on the possession of information about an auxiliary variable x, or a vector of auxiliary variables, available for the entire population. Regression estimates ...