Editing Effect size (section)

==== Cohen's g ====
One of simplest effect sizes for measuring how much a proportion differs from 50% is Cohen's g.<ref name="CohenJ1988Statistical" />{{Rp|page=147}} It measures how much a proportion differs from 50%. For example, if 85.2% of arrests for car theft are males, then effect size of sex on arrest when measured with Cohen's g is <math>g = 0.852-0.5=0.352</math>. In general:

<math>g = P - 0.50 \text{ or } 0.50 - P \quad (\text{directional}),
</math>

<math>g = |P - 0.50| \quad (\text{nondirectional}).
</math>

Units of Cohen's g are more intuitive (proportion) than in some other effect sizes. It is sometime used in combination with [[Binomial test]].