Combined Standard Deviation for Multiple Groups
Computes the pooled standard deviation for multiple groups.
This function also returns the combined mean and the total sample size across all groups.
Use this function to combine subgroups into one combined group. This requires subgroup means, SDs, and sample sizes. SDp_from_SD calculates a pooled within group SD denominator for two independent groups and is not the same as combining subgroups into one group when subgroup means differ.
This function also returns the combined mean and the total sample size across all groups.
Use this function to combine subgroups into one combined group. This requires subgroup means, SDs, and sample sizes. SDp_from_SD calculates a pooled within group SD denominator for two independent groups and is not the same as combining subgroups into one group when subgroup means differ.
Within Study Result
Result
Function References
Cochrane Handbook
Rücker G, Cates CJ, Schwarzer G. Methods for including information from multi-arm trials in pairwise meta-analysis. Res Synth Methods. 2017 Dec;8(4):392-403. doi: 10.1002/jrsm.1259. Epub 2017 Aug 25. PMID: 28759708.
How to Cite
Emprechtinger, R., Schwarzer, G., Tölch, U., Schreder, G., & Gartlehner, G. (2025). Assessing the effectiveness of metaHelper: A randomized controlled trial of a web application and R package to streamline statistical transformations in meta-analysis. Journal of Clinical Epidemiology, 179, 111640. https://doi.org/10.1016/j.jclinepi.2024.111640