topic Re: How does JMP perform Group X function in Graph Builder? in Discussions

How does JMP perform Group X function in Graph Builder?

robbob — Wed, 19 Oct 2016 02:06:45 GMT

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?

Re: How does JMP perform Group X function in Graph Builder?

txnelson — Tue, 08 Mar 2016 20:06:22 GMT

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.

Re: How does JMP perform Group X function in Graph Builder?

ian_jmp — Wed, 09 Mar 2016 12:33:36 GMT

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

Re: How does JMP perform Group X function in Graph Builder?

Jeff_Perkinson — Wed, 19 Oct 2016 02:06:55 GMT

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).

Re: How does JMP perform Group X function in Graph Builder?

robbob — Wed, 09 Mar 2016 13:55:45 GMT

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

Re: How does JMP perform Group X function in Graph Builder?

Jeff_Perkinson — Wed, 09 Mar 2016 14:02:54 GMT

It uses quantiles.

-Jeff