Combined Group Summary Calculator
Combine independent, disjoint group means and sample SDs with both within- and between-group variation.
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Calculation results
Total observations: 6
Combined mean: 3.5
Combined sample SD: 1.87083
Assumptions and limits
Independent, disjoint groups measuring the same quantity in the same units. Includes within-group and between-group variation; this is the combined sample SD, not the pooled within-group SD. Group sizes must be whole numbers from 2 to 10 million. Maximum 20 groups.
Cochrane: combining groups · Read the practical guide · Download blank worksheet (TXT)