| se.mean2 {vcmeta} | R Documentation |
Computes the standard error for a 2-group mean difference
Description
This function computes the standard error of a 2-group mean difference using the estimated means, estimated standard deviations, 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 mean differences from a combination of 2-group and paired-samples experiments are used in the meta-analysis. Equality of variances is not asumed.
Usage
se.mean2(m1, m2, sd1, sd2, n1, n2)
Arguments
m1 |
estimated mean for group 1 |
m2 |
estimated mean for group 2 |
sd1 |
estimated standard deviation for group 1 |
sd2 |
estimated standard deviation for group 2 |
n1 |
sample size for group 1 |
n2 |
sample size for group 2 |
Value
Returns a one-row matrix:
Estimate - estimated mean difference
SE - standard error
References
Snedecor GW, Cochran WG (1980). Statistical methods, 7th edition. ISU University Pres, Ames, Iowa.
Examples
se.mean2(21.9, 16.1, 3.82, 3.21, 40, 40)
# Estimate SE
# Mean difference: 5.8 0.7889312