Normal Probability Plots - Quick Tab

Graphical Analytic Techniques

Use the options on the Quick tab of the Normal Probability Plots dialog to specify the variables and type of graph to use when creating the probability plot.

Graph type. Select the type of probability plot to be plotted from the Graph type list. Click the desired plot link below for a brief description of that type of graph.

Statistics. You can include statistics as footnotes in the graph by selecting the statistics listed in this group box.

Shapiro-Wilk. Select this check box to include the Shapiro-Wilk W statistic for normality and its associated p-value.

Plot layout. You can specify the plot layout using the options in this group box.

Multiple plots in one graph. When you have chosen more than one variable 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, which enables you to see all data points, even the ties. When this check box is not selected, the "tied" points will overlap.

Variables. Click the Variables button to display the standard variable selection dialog, 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 tab below the Variables button.