Standardised mean difference (SMD)
Revision as of 16:32, 17 November 2023 by Editor iHTS (talk | contribs) (Created page with "The difference between two means, divided by an estimate of the within-group standard deviation. '''Note:''' When a continuous variable (such as pain) is measured in a variety of ways across studies (using different scales), it may prove impossible to compare or combine the study results in a meta-analysis. If the effects are expressed as a standardised value, the results can be combined, since they are no longer expressed as units of measurement. Standardised mean diff...")
The difference between two means, divided by an estimate of the within-group standard deviation.
Note: When a continuous variable (such as pain) is measured in a variety of ways across studies (using different scales), it may prove impossible to compare or combine the study results in a meta-analysis. If the effects are expressed as a standardised value, the results can be combined, since they are no longer expressed as units of measurement. Standardised mean differences are sometimes referred to as a “d index.”*
*Concept introduced by J. Cohen (1988).
Alternative spelling: standardized mean difference (SMD)