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robbob
Level I

How does JMP perform Group X function in Graph Builder?

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?

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5 REPLIES 5
txnelson
Super User

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

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.

Jim
ian_jmp
Staff

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

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
Community Manager Community Manager

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

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).

11109_JMPScreenSnapz004.png

-Jeff
robbob
Level I

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

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

Jeff_Perkinson
Community Manager Community Manager

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

It uses quantiles.

-Jeff

-Jeff