ci.prop2: Confidence interval for a 2-group proportion difference

In statpsych: Statistical Methods for Psychologists

Confidence interval for a 2-group proportion difference

Description

Computes an adjusted Wald confidence interval for a proportion difference in a 2-group design.

Usage

ci.prop2(alpha, f1, f2, n1, n2)

Arguments

alpha	alpha level for 1-alpha confidence
f1	number of participants in group 1 who have the attribute
f2	number of participants in group 2 who have the attribute
n1	sample size for group 1
n2	sample size for group 2

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

Agresti2000statpsych

Examples

ci.prop2(.05, 35, 21, 150, 150)

# Should return:
#        Estimate         SE          LL        UL
# [1,] 0.09210526 0.04476077 0.004375769 0.1798348

statpsych documentation built on July 9, 2023, 6:50 p.m.