PracTools
is an R package with functions that compute sample sizes for various types of
finite population sampling designs when totals or means are estimated. One-, two-, and three-stage
designs are covered as well as allocations for stratified sampling and probability proportional to size
sampling. Sample allocations can be computed that minimize the variance of an estimator subject to a
budget constraint or that minimize cost subject to a precision constraint. The package also contains
some specialized functions for estimating variance components and design effects. Several finite
populations are included that are useful for classroom instruction
