Table 2.

Power analysis methods

Type	Independent variable	Dependent variable
1. A priori	Power (1-β), significance level (α), and effect size	N
2. Compromise	Effect size, N, q=β/α	Power (1-β), significance level (α)
3. Criterion	Power (1-β), effect size, N	Significance level (α), criterion
4. Post-hoc	Significance level (α), effect size, N	Power (1-β)
5. Sensitivity	Significance level (α), power (1-β), N	Effect size

N, sample size; q=β/α, error probability ratio, which indicates the relative proportionality or disproportionality of the 2 values.