Description Usage Arguments Value Examples
View source: R/stepped_wedge.r
Function to calculate sample size requirements for a stepped wedge cluster randomised study.
1 | get_ss_swedge(z1 = 1.96, z2 = 0.84, p1, p2, deff)
|
z1 |
The z-score indicating level of significance (confidence interval). Default at 1.96 for 95% confidence interval. |
z2 |
desired power. Default at 0.84 for 80% power. |
p1 |
Expected proportion for control group. |
p2 |
Expected proportion for intervention group |
deff |
Design effect of a stepped wedge cluster randomised study |
A numeric value of sample size needed for a stepped wedge cluster ranomised study
1 2 3 4 | get_ss_swedge(z1 = 1.96, z2 = 0.84,
p1 = 0.2, p2 = 0.15,
deff = get_deff_swedge(k = 2, b = 1, t = 1,
icc = 0.034, size = 192))
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