This function creates a panel which allows the sample size, population means and common standard deviation to be set. The correponding power curve for a two-sample t-test is displayed in the graphics window.
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)a logical value determining whether an interactive panel is created.
a logical value determining whether the plot is placed inside the panel.
a logical value determining whether the populations are initially showing.
a vector which determines the grid a sample sizes used.
the initial values of the means of the two populations.
the initial value of the common standard deviation of the two populations.
the initial value of the sample size.
the grid of values over which the populations are plotted.
the upper limit on the population density scale.
scaling parameters for the size of the plot.
Nothing is returned.
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 diplayed.
rpanel: Simple interactive controls for R functions using the tcltk package. Journal of Statistical Software, 17, issue 9.