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Calculate the variance of a percentage. See Fowler, Jr. (2014, p. 34, ISBN: 978-1-4833-1240-8)
var_of_percentage(percent = NULL, n = NULL)
a vector of percentages; each of the percentage values must be between 0 and 100
a vector of sample sizes; number of observations used to calculate each of the percentage values
var_of_percentage(percent = 40, n = 50) var_of_percentage(percent = 50, n = 10)
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