Combine Mean & Standard Deviation (SD) & Total for More than One Group into Single One

Group 1

Group 2

Group 3

If you want to combine only 2 groups, enter 0 for Mean 3, SD 3, and Total 3.

Combined Data


Combined Mean:

Combined SD:

Combined Total:

Description of the formula

Variables Definitions

  1. Group 1, Group 2, Group 3:
    • Mean (mean1, mean2, mean3): The average value of the data in each group.
    • Standard Deviation (SD) (sd1, sd2, sd3): A measure of the amount of variation or dispersion in each group.
    • Total (total1, total2, total3): The total number of observations in each group.
  2. Combined Data:
    • Combined Mean: The weighted average of the means from the selected groups based on the total number of observations.
    • Combined SD: The combined standard deviation is calculated using a formula that considers the standard deviations and means of the selected groups.
    • Combined Total: The total number of observations after combining the selected groups.

  3. Formula

  4. **Formula Reference - Cochrane Handbook**