nLogOdds {PracTools}

Calculate simple random sample size for estimating a proportion

Description

Calculate the simple random sample size for estimating a proportion using the log-odds transformation.

Usage

    nLogOdds(moe.sw, e, alpha=0.05, pU, N=Inf)

Arguments

moe.sw

switch for setting desired margin of error (1 = CI half-width on the proportion; 2 = CI half-width on a proportion divided by pU)

e

desired margin of error

alpha

1 - (confidence level)

pU

population proportion

N

number of units in finite population

Details

The function accepts five parameters, which are the same ones as accepted by nPropMoe. The desired margin of error can be specified as the CI half-width on the proportion (moe.sw=1) or as the CI half-width as a proportion of the population value pU (moe.sw=2).

Value

numeric sample size

Author(s)

Richard Valliant, Jill A. Dever, Frauke Kreuter

References

Valliant, R., Dever, J., Kreuter, F. (2018, chap. 3). Practical Tools for Designing and Weighting Survey Samples, 2nd edition. New York: Springer.

See Also

nProp, nPropMoe, nWilson, nCont

Examples

nLogOdds(moe.sw=1, e=0.05, alpha=0.05, pU=0.2, N=Inf)
nLogOdds(moe.sw=2, e=0.05, alpha=0.05, pU=0.2, N=Inf)