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? test.jmp

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How does JMP perform Group X function in Graph Builder?

robbob

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?

test.jmp

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txnelson

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.

ian_jmp

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

Jeff_Perkinson

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).

robbob

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

Jeff_Perkinson

It uses quantiles.

-Jeff