size.ci.tetra: Sample size for a tetrachoric correlation confidence interval

In statpsych: Statistical Methods for Psychologists

Sample size for a tetrachoric correlation confidence interval

Description

Computes the sample size required to estimate a tetrachoric correlation with desired confidence interval precision. Set the tetrachoric planning value to the smallest value within a plausible range for a conservatively large sample size.

Usage

size.ci.tetra(alpha, p1, p2, cor, w)

Arguments

alpha	alpha level for 1 - alpha confidence
p1	planning value for row 1 marginal proportion
p2	planning value for column 1 marginal proportion
cor	tetrachoric planning value
w	desired confidence interval width

Value

Returns the required sample size

References

\insertRef

Bonett2005statpsych

Examples

size.ci.tetra(.05, .4, .3, .5, .3)

# Should return:
#  Sample size
#          296

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.