fupower: Power for followup studies
In tobyjohnson/gtx: Genetics ToolboX

Description Usage Arguments Details Author(s) Examples

Provides a simple calculation of power for followup studies using only the discovery P-value and sample size, and followup sample size(s).

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fupower(p0, n0, n1, beta0, invlog = FALSE, alpha = 0.05,
        plty = c("solid", "dashed", "dotdash"), elty = "dotted",
        pcol = "red", ecol = "blue")

`p0`	Discovery P-value
`n0`	Discovery sample size
`n1`	Vector of followup sample size(s)
`beta0`	Discovery effect size (optional)
`invlog`	Whether to label x-axis using inverse log transformed values
`alpha`	Alpha level for one-sided followup test
`plty`	Power line type, recycled to length of `n1`
`elty`	Effect line type
`pcol`	Power line colour, recycled to length of `n1`
`ecol`	Effect line colour

See the examples.

Toby Johnson Toby.x.Johnson@gsk.com

par(mar = c(3, 3, 0, 0) + 0.5, mgp = c(2, 1, 0), mfrow = c(3, 2))
fupower(.05, 1000, c(1000, 300), beta0 = log(1.5), invlog = TRUE)
fupower(5e-4, 1000, c(1000, 300), beta0 = log(1.5), invlog = TRUE)
fupower(5e-8, 1000, c(1000, 300), beta0 = log(1.5), invlog = TRUE)