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).

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

Examples

test.prop2(11, 26, 50, 50)

# Should return:
# Estimate        z           p
#     -0.3 2.899726 0.003734895

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