Upper confidence limit of a variance

Computes an upper confidence limit for a population variance using an estimated variance from a sample of size n in a prior study. The upper limit can be used as a variance planning value in sample size functions for desired power that require a planning value of the population variance.

Usage

ci.var.upper(alpha, var, n)

Arguments

alpha

alpha value for 1-alpha confidence (one-sided)

var

estimated variance

n

sample size

Value

Returns an upper limit (UL) variance planning value

Examples

ci.var.upper(.25, 15, 60)
#>        UL
#>  17.23264

# Should return:
#       UL
# 17.23264