3D Histogram by... - Discrete by Discrete

Select this Graphs of Input Data - 3D Histogram by... option when you have highlighted a discrete variable in the spreadsheet and you want to plot another discrete variable on the second axis of the bivariate histogram. After you have selected the second variable, the Select Codes dialog will open in which you will designate the codes for each variable. (Click on the OK button to accept all of the codes for both variables.)