topic Re: Homoscedasticity of data using Cochran C test in JMP in Discussions

Homoscedasticity of data using Cochran C test in JMP

rajesh — Tue, 17 Dec 2019 12:26:01 GMT

How to evaluate Homoscedasticity of data by using Cochran C test in JMP?

Re: Homoscedasticity of data using Cochran C test in JMP

Mark_Bailey — Tue, 17 Dec 2019 13:21:16 GMT

A quick way to check for a statistic or model is to select Help > Statistics Index. The items are listed alphabetically and you can jump to a group of items starting with a particular character by typing that character. Cochran's C test is not available.

The Wikipedia entry for Cochran's C Test shows that this computation is pretty straight-forward so you could compute it by hand or with a script.

Note that JMP provides other tests for homoscedasticity in the Oneway platform. Select Analyze > Fit Y by X. Assign your data columns to the Y and X roles and click OK. Click the red triangle and select Unequal Variances.

Re: Homoscedasticity of data using Cochran C test in JMP

rajesh — Tue, 17 Dec 2019 13:00:19 GMT

Thanks, Followed the steps you mentioned but unable to see Unequal variance option by clicking red triangle. Please suggest.

Re: Homoscedasticity of data using Cochran C test in JMP

Mark_Bailey — Tue, 17 Dec 2019 13:25:19 GMT