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Hypothesis test for a 2-group proportion difference

Source: R/statpsych3.R
test.prop2.Rd

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

Snedecor GW, Cochran WG (1989). Statistical Methods, 8th edition. ISU University Pres, Ames, Iowa.

Bonett DG (2021). Statistical Methods for Psychologists https://dgbonett.sites.ucsc.edu/.

Examples

test.prop2(39, 24, 50, 50)
#>  Estimate      z       p
#>       0.3 2.8997 0.00373

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