Plot Method for bbssr_sgrid Objects

Draws the power or the expected total sample size of the stratified designs of StratGridBSSR against a chosen column, with one colour per value of another column and, optionally, one panel per value of a third, as plot.bbssr_grid does for two groups.

Usage

# S3 method for class 'bbssr_sgrid'
plot(x, x.by = NULL, xlab = NULL, ...)

Arguments

x

An object of class bbssr_sgrid

x.by

Name of the numeric column of x on the horizontal axis. The default of NULL takes the first of the true pooled response probabilities p.S1, p.S2, ... that varies between the scenarios, or the index scenario when none varies

xlab

Label of the horizontal axis. NULL makes it from x.by

...

Further arguments of plot.bbssr_grid: what, colour.by, facet.by, main, sub, ylab, ref.line, legend.title and base_size

Value

A ggplot object

Details

The lines join the scenarios of a design in the order of the horizontal axis, so the scenarios should differ in a single probability, or x.by should name a column in which they all differ; a warning is given when two scenarios of a design share a value on the axis.

Examples

design <- data.frame(Test = c('CMH', 'Strat-Fisher'))
grid <- StratGridBSSR(design, p = rbind(c(0.3, 0.5), c(0.4, 0.6)), Delta.A = 0.3,
                      N1 = c(10, 10), N2 = c(10, 10), omega = 0.5, r = 1,
                      alpha = 0.05, tar.power = 0.8, ss.method = 'standard')
plot(grid, colour.by = 'Test')

plot(grid, what = 'E.N', x.by = 'p.S2', colour.by = 'Test')