On the 2D Histograms dialog - Advanced tab, select the Boundaries option button in the Intervals group box, and then click the Specify Boundaries button to display the Specify Boundaries for dialog.
Specify boundary range.
Select the Specify boundary range
option button, and enter the Minimum,
Interval Step, and Maximum.
This sets the binning ranges for a histogram. The ’min/max/step’ option
will be expressed as continuous rather than using the discrete ’boundaries’
approach. This will allow distributional fits to be used for this method.
Enter Upper Boundaries. Select the Enter Upper Boundaries option button, and in the adjacent box, enter a list of the desired boundaries for the selected variable. For example, if you enter 1 3 4 9, then the following five ranges (i.e., categories) of values of the selected variable will be created:
x<=1
1<x<=3
3<x<=4
4<x<=9
9<x
As you can see from this example, the intervals do not have to be of equal width, but the boundaries do need to be of consecutive numbers (e.g., 1 3 9, not 1 3 1 9).
OK. Click the OK button to accept the entries and return to the 2D Histograms dialog.
Cancel. Click the Cancel button to close this dialog without specifying any boundaries.