SD_within_from_SD_r {metaHelper}

Within-Group Standard Deviation for Matched Groups

Description

Computes the within-group standard deviation for matched groups. This within-group standard deviation can be used to calculate standardized mean differences for matched groups. This method requires a correlation coefficient r.

Usage

SD_within_from_SD_r(SD_diff, r)

Arguments

SD_diff

standard deviation of the difference

r

correlation between pair of observations

Value

Within standard deviation

References

Borenstein, M., Hedges, L.V., Higgins, J.P.T. and Rothstein, H.R. (2009). Effect Sizes Based on Means . In Introduction to Meta-Analysis (eds M. Borenstein, L.V. Hedges, J.P.T. Higgins and H.R. Rothstein). https://doi.org/10.1002/9780470743386.ch4

Examples

# SD_diff is the standard deviation of the group difference
SD_diff <- 2
# r is the correlation coefficient between the groups
r <- 0.5
SD_within_from_SD_r(SD_diff, r)