1 Choose Graph > Dotplot.
2 Choose One Y - Stack Groups, then click OK.
3 In Graph variables, enter one or more columns of data. Minitab displays a separate graph for each column.
4 In Categorical variables for grouping (1-4, outermost first), enter one to four columns of grouping (categorical) variables. The first variable will be the outermost and the last will be the innermost.
5 If you like, use any dialog box options, then click OK.