How does JMP perform Group X function in Graph Builder?

[#1]

I am curious how JMP organizes data with the Group X function.  For this example:

• Temperature is X axis
• Y is Y axis
• Condition is used for overlay
• Measurement is used in Group X

Does JMP simply create groups based on the number of data points?

[#2]

because your X grouping column is continuous JMP divides the groupings into equal number groups.  If the column was ordinal or nominal it would create a grouping for each value found for the column.

[#3]

If you don't like what JMP gives you by default, you can easily make changes. See 'Separate Variables into Groups' at:

http://www.jmp.com/support/help/Add_Variables.shtml#100031

[#4]

For a continuous column in either the Group X or Group Y role, JMP uses quantiles to divide the data into 5 groups.

As Ian@JMP​ points out, you can right click on the grouping variable label and select Number of Levels to change how many groups are created (still based on quantiles).

[#5]

Does it use quantiles to divide the data or simply put equal amounts of data into each group? 

[#6]

It uses quantiles.

-Jeff