Standardized Mean Difference (SMD) from Means and Pooled Standard Deviation
Calculates the SMD. It needs to be provided with the pooled standard deviation. If the pooled standard deviation is not available SMD_from_group provides a direct method to calculate the SMD and also offers different forms like Hedges' g or Cohen's d.
CAVE: If you want to get Hedges' g it is insufficient to simply pool the standard deviation with SDp_from_SD . The resulting SMD needs to be further multiplied with the hedges factor. This is done automatically when you use SMD_from_group .
CAVE: If you want to get Hedges' g it is insufficient to simply pool the standard deviation with SDp_from_SD . The resulting SMD needs to be further multiplied with the hedges factor. This is done automatically when you use SMD_from_group .
Within Study Result
Result
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