rp.power {rpanel}

Interactive power calculations for a two-sample t-test

Description

This function creates a panel which allows the sample size, population means and common standard deviation to be set. The corresponding power curve for a two-sample t-test is displayed in the graphics window.

Usage

rp.power(panel = TRUE, panel.plot = TRUE, populations.showing = FALSE,
         ngrid = seq(10, 300), mu1 = 0, mu2 = 1,
         sigma = 1, n = 20, xgrid = seq(- 4, 5, length = 100),
         popdens.lim = 0.7, hscale = 1, vscale = hscale)

Arguments

panel

a logical value determining whether an interactive panel is created.

panel.plot

a logical value determining whether the plot is placed inside the panel.

populations.showing

a logical value determining whether the populations are initially showing.

ngrid

a vector which determines the grid a sample sizes used.

mu1, mu2

the initial values of the means of the two populations.

sigma

the initial value of the common standard deviation of the two populations.

n

the initial value of the sample size.

xgrid

the grid of values over which the populations are plotted.

popdens.lim

the upper limit on the population density scale.

hscale, vscale

scaling parameters for the size of the plot.

Details

The population parameters and sample size are controlled by doublebuttons. The sample size refer to the total sample size, assuming two groups of equal size. A checkbox allows plots of the population distributions also to be displayed.

Value

Nothing is returned.

References

rpanel: Simple interactive controls for R functions using the tcltk package. Journal of Statistical Software, 17, issue 9.

Examples

## Not run: 
  rp.power()

## End(Not run)