If you have no variables in the X or Y zone, you can drag multiple variables from the Variables list into the X or Y zone. This merges the selected variables.
If you have existing variables in the X or Y zone where you want to add variables, note the following:
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If you merge a categorical variable with an existing continuous variable, then the categorical variable is transformed into integer values. For example, using the Students.jmp data, if sex is merged with height, the values of sex (F and M) are transformed into 0 and 1. The transformation allows the two variables to use the same axis and scale.

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Note: If you try to order a numeric variable with another numeric variable, JMP defaults to a merge. See Merge Variables.
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The default ordering statistic is the mean. To use another statistic, rightclick on the variable and select Order Statistic. The available statistics are N, Mean, Median, Min, Max, Range, Sum, and % of Total.

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To remove the ordering, rightclick and select Remove Order.

If you have two Y variables, you can move one of the variables to create a second Y axis. Rightclick on the Y variables and select Move Right. Select the variable that you want to move.