Perform a PP-plot (probability plot).
If F is the CDF of the distribution dist with parameters params and x a sample vector of length n, the PP-plot graphs ordinate y(i) = F (i-th largest element of x) versus abscissa p(i) = (i - 0.5)/n. If the sample comes from F, the pairs will approximately follow a straight line.
The default for dist is the standard normal distribution.
The optional argument params contains a list of parameters of dist.
For example, for a probability plot of the uniform distribution on [2,4] and x, use
ppplot (x, "uniform", 2, 4)
dist can be any string for which a function dist_cdf that calculates the CDF of distribution dist exists.
If no output is requested then the data are plotted immediately.
See also: qqplot.
Package: statistics