test.prop2: Hypothesis test for a 2-group proportion difference

In statpsych: Statistical Methods for Psychologists

Hypothesis test for a 2-group proportion difference

Description

Computes a continuity-corrected z-test for a difference of population proportions in a 2-group design. A confidence interval for a difference in population proportions is a recommended supplement to the z-test (see ci.prop2).

For more details, see Section 2.4 of Bonett (2021, Volume 3)

Usage

test.prop2(f1, f2, n1, n2)

Arguments

f1	number of group 1 participants who have the attribute
f2	number of group 2 participants 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 - ML estimate of proportion difference

• z - z test statistic

• p - two-sided p-value

References

\insertRef

Snedecor1980statpsych

\insertRef

Bonett2021statpsych

Examples

test.prop2(39, 24, 50, 50)

# Should return:
# Estimate      z       p
#      0.3 2.8997 0.00373

statpsych documentation built on Jan. 13, 2026, 1:07 a.m.