| se.prop2 {vcmeta} | R Documentation |
Computes the estimate and standard error for a 2-group proportion difference
Description
This function computes the Agresti-Caffo standard error of a 2-group proportion difference using the frequency counts and sample sizes. The effect size estimate and standard error output from this function can be used as input in the meta.ave.gen, meta.lc.gen, and meta.lm.gen functions in applications where compatible proportion differences from a combination of 2-group and paired-samples studies are used in the meta-analysis.
Usage
se.prop2(f1, f2, n1, n2)
Arguments
f1 |
number of participants in group 1 who have the outcome |
f2 |
number of participants in group 2 who have the outcome |
n1 |
sample size for group 1 |
n2 |
sample size for group 2 |
Value
Returns a one-row matrix:
Estimate - estimated proportion difference
SE - standard error
References
Agresti A, Caffo B (2000). “Simple and Effective Confidence Intervals for Proportions and Differences of Proportions Result from Adding Two Successes and Two Failures.” The American Statistician, 54(4), 280-288. doi:10.1080/00031305.2000.10474560.
Examples
se.prop2(31, 16, 40, 40)
# Should return:
# Estimate SE
# Proportion difference: 0.3571429 0.1002777