1.
Select Help > Sample Data Library and open Spring.jmp.
The table has a row for each day in the month of April. The column named April is the numeric day of the month, and the remaining columns are various weather statistics.
2.
Select the Overlay Plot command from the Graph menu.
3.
Select Humid1:PM and Humid4:PM and click Y.
4.
Select April and click X.
5.
The plot shown in Plot with Legend appears. Initially, this platform overlays all specified Y columns. The legend below the plot shows individual markers and colors that identify each Y column.
Plot with Legend
To help you quickly differentiate between the Ys, select Y Options > Connect Points from the Overlay Plot red triangle menu. Adjacent points are connected for each Y variable, as shown in Plot with Connected Points.
Plot with Connected Points
The Overlay Plot Launch Window
The columns assigned to the Y role have a left- or right-pointing arrow to the left of the column name. This arrow designates on which vertical axis (on the left or right of the plot) the variable appears. Change the designation by highlighting the column in the Y list and clicking the Left Scale/Right Scale button.
This option applies a log scale to the left y-axis. It is available only if one or more Y variables are left-scaled. (See Left Scale/Right Scale in this table.)
This option applies a log scale to the right y-axis. It is available only if one or more Y variables are right-scaled. (See Left Scale/Right Scale in this table.)
After you click OK, the Overlay plot appears. See The Overlay Plot.