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Computes an approximate sample size required to estimate a population coefficient of variation (CV) with desired confidence interval precision. Set the CV planning value to the largest value within a plausible range for a conservatively large sample size.

Usage

size.ci.cv(alpha, CV, w)

Arguments

alpha

alpha level for 1-alpha confidence

CV

planning value of coefficient of variation

w

desired confidence interval width

Value

Returns the required sample size

Examples

size.ci.cv(.05, .25, .10)
#>  Sample size
#>           60

# Should return:
# Sample size
#          60