Probability-Probability Plots - Quick Tab

Click the Variables button to display the standard variable selection dialog box, in which you select the variable(s) to be plotted. If you select more than one variable, then a sequence of graphs (one for each variable selected) will be produced. The selection that you make will then be displayed in the area of the dialog below the Variables button.

Select the desired theoretical distribution for this graph.

Beta	Lognormal
Exponential	Normal
Extreme Value	Rayleigh
Gamma	Weibull

Compute from data. If this check box is selected, the parameters for the specified distribution will be estimated from the data. For more details on available distributions and their parameters, see the Advanced tab.

Specify the plot layout in this group box.

When more than one variable has been selected to be plotted, select the Multiple plots in one graph check box to create an overlaid probability plot. When this check box is selected, several probability plots will be displayed in the graph: one for each selected variable. A different point marker and color is used for each of the multiple variables and referenced in the legend so that individual plots representing different variables can be discriminated in the graph. When this check box is cleared, separate graphs will be generated for each variable.

Do not assign average ranks to tied observations. This check box is selected by default, and enables you to see all data points, even the ties. When this check box is cleared, the "tied" points will overlap.