The ProbabilityPlot command generates a probability-probability plot of the user-defined theoretical distribution (on the horizontal axis) against the response values (on the vertical axis). The response values will be sorted, unless otherwise specified (see sorted option). A random sample of the theoretical distribution, having size equal to the size of data will be generated, sorted ascendingly, and plotted against the (ordered) response values.

The first parameter, A, specifies the response values that correspond to the y-coordinates of the points in the plot. A copy of the response values is sorted ascendingly in the function (i.e. if sorted is false as it is by default), and is plotted against a sorted random sample of the given theoretical distribution that correspond to the x-coordinates of the plot.

The second parameter, X is the theoretical distribution or the corresponding random variable.

The options argument can contain one or more of the options shown below. All unrecognized options will be passed to the plots[display] command. See plot[options] for details.

color=name or list

This option specifies colors for the points and for the reference line. When a list of colors is given, the set of points and the reference line will be colored with the corresponding colors in the list.

reference=truefalse

If reference is set to true, the reference line  will be drawn in the same plot. Default value is true.

sorted=truefalse

If sorted is set to true, a sorted (ascending) copy of data is used. Otherwise, if false the original data is used. Default value is false.