Fit/Result Graphs/P-P Plot

The P-P Plot can be accessed from the Result Graphs sub menu of the Fit menu.   It is activated only after specific distributions have been chosen.

The P-P Plot, as shown below, is a plot of the probability of the ith data point in the input data [straight line] from the Data Table versus the probability of that point from the fitted cumulative distribution.   This plot tends to be sensitive to variations in the center of the fitted data. (see Law&Kelton1)   If more than one distribution was fit to the input data, the list at the top right will allow a choice of available P-P plots of fitted distributions.  Clicking a distribution will add that distribution to the plot.  The list at the bottom right contains the densities plotted for comparison.  Clicking a distribution in this list will remove that distribution from the plot.  The legend will contain color-coded identification of the plotted distributions and input as shown in the second plot.

This graph, as with all graphs in Stat::Fit, may be modified, saved, copied, or printed with options generally given in the Graph Style , Save As, and Copy commands in the Graphics menu.

1. "Simulation Modeling & Analysis", Averill M. Law, W. David Kelton, 1991, McGraw-Hill, p 339