PracTools: nDomain – R documentation

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nDomain

Compute a simple random sample size for an estimated mean or total for a domain

Description

Compute a simple random sample size using either a target coefficient of variation, CV_{0}(d), or target variance, V_{0}(d), for an estimated mean or total for a domain.

Usage

nDomain(CV0d=NULL, V0d=NULL, S2d=NULL, ybarUd=NULL, N=Inf, CVpopd=NULL, Pd, est.type)

Arguments

`CV0d`	target value of coefficient of variation of estimated domain mean or total
`V0d`	target value of variance of estimated domain mean or total
`S2d`	unit (population) variance for domain units
`ybarUd`	population mean of target variable for domain units
`N`	number of units in full finite population (not just the domain population)
`CVpopd`	unit (population) coefficient of variation for domain units
`Pd`	proportion of units in the population that are in the domain
`est.type`	type of estimate; allowable values are `"mean"` or `"total"`

Details

If CV0d is the desired target, then the unit CV, CVpopd, or the domain population mean and variance, ybarUd and S2d, must also be provided. If V0d is the constrained value, then ybarUd must be also be included in the function call. CV0d will then be computed as sqrt(V0d)/ybarUd.

Value

numeric sample size

Author(s)

Richard Valliant, Jill A. Dever, Frauke Kreuter

References

Valliant, R., Dever, J., Kreuter, F. (2013, sec. 3.5.2). Practical Tools for Designing and Weighting Survey Samples. New York: Springer.

Examples

nDomain(CV0d=0.05, N=Inf, CVpopd=1, Pd=0.5, est.type="total")
nDomain(CV0d=0.05, N=Inf, CVpopd=1, Pd=0.5, est.type="mean")
nDomain(V0d=50, ybarUd=50, S2d=100, N=Inf, Pd=0.5, est.type="total")
nDomain(CV0d=0.05, ybarUd=50, S2d=100, N=Inf, Pd=0.5, est.type="total")
nDomain(CV0d=0.05, ybarUd=50, S2d=100, N=Inf, Pd=0.5, est.type="mean")

PracTools

Tools for Designing and Weighting Survey Samples

v1.2.2

GPL (>= 2)

Authors