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Level I

## Multiple Comparison Intervals for Standard Deviation (Test for Equal Variance)

Attached is a sample from Minitab of Multiple comparison intervals for the standard deviation.

So, it is a crossed factor test for equal variance.

Does jmp have a similar function? Had been trying to do to Fit Y by X but it only separates it.

1 ACCEPTED SOLUTION

Accepted Solutions
Super User

## Re: Multiple Comparison Intervals for Standard Deviation (Test for Equal Variance)

Hi @carlogarcia, I think a Oneway analysis from the Fit Y by X platform might have your answer.   Launch Fit Y by X with a categorical column in the X and a continuous column in the Y.  You might need to make a column that contains the string '10/2' for Temp = 10 and Oxygen = 2, and use that in the X.  Then from the red triangle menu, select 'Unequal Variances'.

Depending on your goal an equivalence test might also help, These were improved in JMP 17:

https://www.jmp.com/support/help/en/17.1/index.shtml#page/jmp/equivalence-tests.shtml

Super User

## Re: Multiple Comparison Intervals for Standard Deviation (Test for Equal Variance)

Hi @carlogarcia, I think a Oneway analysis from the Fit Y by X platform might have your answer.   Launch Fit Y by X with a categorical column in the X and a continuous column in the Y.  You might need to make a column that contains the string '10/2' for Temp = 10 and Oxygen = 2, and use that in the X.  Then from the red triangle menu, select 'Unequal Variances'.

Depending on your goal an equivalence test might also help, These were improved in JMP 17:

https://www.jmp.com/support/help/en/17.1/index.shtml#page/jmp/equivalence-tests.shtml