Table 1 Properties of measures of heterogeneity.
From: Undue reliance on I 2 in assessing heterogeneity may mislead
Measure | measured on | increasing with | ||
|---|---|---|---|---|
scale | range | number of studies in meta-analysis | precision (size of studies) | |
Q | absolute | [0, ∞) | yes | yes |
I 2 | percent | [0, 100%] | no | yes |
τ, τ 2 | outcome | [0, ∞) | no | no |
H, H 2 | absolute | [1, ∞) | no | yes |
R, R 2 | absolute | [1, ∞) | no | yes |