ci.prop.ps: Confidence interval for a paired-samples proportion...

In statpsych: Statistical Methods for Psychologists

Confidence interval for a paired-samples proportion difference

Description

Computes an adjusted Wald confidence interval for a difference of proportions in a paired-samples design. This function requires the frequency counts from a 2 x 2 contingency table for two repeated dichtomous measurements.

Usage

ci.prop.ps(alpha, f00, f01, f10, f11)

Arguments

alpha	alpha level for 1-alpha confidence
f00	number of participants with y = 0 and x = 0
f01	number of participants with y = 0 and x = 1
f10	number of participants with y = 1 and x = 0
f11	number of participants with y = 1 and x = 1

Value

Returns a 1-row matrix. The columns are:

• Estimate - adjusted estimate of proportion difference

• SE - adjusted standard error

• LL - lower limit of the adjusted Wald confidence interval

• UL - upper limit of the adjusted Wald confidence interval

References

\insertRef

Bonett2012statpsych

Examples

ci.prop.ps(.05, 12, 4, 26, 6)

# Should return:
# Estimate         SE        LL        UL
#     0.44 0.09448809 0.2548067 0.6251933

statpsych documentation built on June 22, 2024, 6:51 p.m.