Table 1 Variance function values for selected distributions and links ([22])
From: Power and sample size calculation for stepped-wedge designs with discrete outcomes
ϕ | a | v(μ) | g(μ) | g′(μ) | |
|---|---|---|---|---|---|
Normal | σ2 | 1 | 1 | μ | 1 |
Bernoulli | 1 | 1 | μ(1−μ) | \(log(\frac {\mu }{1-\mu })\) | \(\frac {1}{\mu (1-\mu)}\) |
Poisson | 1 | \(\frac {1}{m_{i}}\) | μ | log(μ) | \(\frac {1}{\mu }\) |
Binomial | 1 | \(\frac {1}{m_{i}}\) | μ(1−μ) | \(log(\frac {\mu }{1-\mu })\) | \(\frac {1}{\mu (1-\mu)}\) |