Section 1: Power
1. Dichotomous outcome (proportions)


2. Continuous outcome (mean values)

Alpha (α) is the significance level, usually 0.05 (5 %). It is the same as the risk of making a Type 1 error (rejecting a true null hypothesis).
Beta (β) is often 0.20 (20 %). It is the same as the risk of making a Type 2 error (accepting a false null hypothesis).
1  β is the power of the study and is often 1  0.20 = 0.80 (80 %).
The power of a study is the probability of rejecting a false null hypothesis.
1. Dichotomous outcome (proportions)


2. Continuous outcome (mean values)

1. Dichotomous outcome (proportions)


2. Continuous outcome (mean values)
