Interpret Cohen's gSource:
Interpret Cohen's g
Value or vector of effect size values.
"cohen1988"(default) or a custom set of
Not directly used.
"Since g is so transparently clear a unit, it is expected that workers in any given substantive area of the behavioral sciences will very frequently be able to set relevant [effect size] values without the proposed conventions, or set up conventions of their own which are suited to their area of inquiry." - Cohen, 1988, page 147.
Rules apply to equally to positive and negative g (i.e., they are given as absolute values).
Cohen (1988) (
d < 0.05 - Very small
0.05 <= d < 0.15 - Small
0.15 <= d < 0.25 - Medium
d >= 0.25 - Large
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd Ed.). New York: Routledge.
interpret_cohens_g(.02) #>  "very small" #> (Rules: cohen1988) #> interpret_cohens_g(c(.3, .15)) #>  "large" "medium" #> (Rules: cohen1988) #>