topic Re: No longer able to find the Shapiro Wilk test in Discussions

No longer able to find the Shapiro Wilk test

Harj — Tue, 28 Jan 2020 15:43:40 GMT

Hi,

I am suddenly unable to find the Shapiro wilk test when assessing data for normality. I used to use the distribution --> continuous fit --> normal --> then goodness of fit (which was shapiro wilk by default if i remember correctly)

Now i dont get 'normal' as an option, instead i get' fit normal' and then the goodness of fit test is Anderson- Darling.

Any idea what happened?

Thanks.

Re: No longer able to find the Shapiro Wilk test

louv — Tue, 28 Jan 2020 16:10:31 GMT

This answer was provided @txnelson....

The Shapiro-Wilk test has deemphasized and moved to being a legacy statistic. To gain access to it, run the Distribution Platform. Under the red triangle for the Column being analyzed select

Continuous Fit==>Enable Legacy Fitters

Then go back to the red triangle, and the new selection option will appear

Legacy Fitters==>Continuous Fit

The Shapiro-Wilk test will be displayed when you select the Goodness of Fit under the Legacy Fitters

Re: No longer able to find the Shapiro Wilk test

AV — Sat, 25 Apr 2020 14:27:27 GMT

Hi,

Even after enabling the legacy filters and going to

Legacy filters ====> Continuous fit

The Shapiro-Wilk option does not show up and if if you run Normal, the KSL test result is displayed. No other Goodness of Fit option under legacy filters. See attached image. (JMP 15.1.0 Pro)

Re: No longer able to find the Shapiro Wilk test

louv — Sat, 25 Apr 2020 16:24:37 GMT

Distribution>Continuous Fit>Enable Legacy Fitters>Legacy Fitters>Continuous Fit>Normal>Goodness of Fit

This is from JMP 15.1

Re: No longer able to find the Shapiro Wilk test

Mark_Bailey — Sat, 25 Apr 2020 17:31:41 GMT

@louv is correct, but it is unnecessary to use the legacy fitter for a normal distribution model. The Shapiro-Wilk test was added to the new fitter along with the Anderson-Darling test in the JMP 15.1 maintenance release.

Re: No longer able to find the Shapiro Wilk test

AV — Sun, 26 Apr 2020 04:51:36 GMT

Thank you very much for your quick reply and screenshots. I had done those steps and it still wouldn't work. I even reset the platform preferences to defaults just in case there was some bug. I was going crazy until I realized my sample was >2000, in which it would default either to the Anderson-Darling test only (through the new fitter, even when legacy fitter had been enabled) or the KSL test (if done via the legacy fitter). If I decrease my sample to below 2000, it works. Thanks again.

Re: No longer able to find the Shapiro Wilk test

AV — Sun, 26 Apr 2020 04:51:54 GMT