Shapiro-Wilk normality test comes up empty

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tkemeny
Posts: 23
Joined: Mon Sep 07, 2020 2:57 pm

Shapiro-Wilk normality test comes up empty

Post by tkemeny »

Hello,

I'm using Jamovi 1.6.18.0 on a Mac (OSX 11.2.3).

I would like my students to be able to run a normality test after a regression. The regression runs fine. But for some reason in Jamovi I get 'Nan' for the statistic. See attached.
screengrab
screengrab
Screenshot 2021-03-26 at 14.13.58.png (112.92 KiB) Viewed 4136 times
Any thoughts about what might be happening here?

Thanks
Tom
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jonathon
Posts: 2613
Joined: Fri Jan 27, 2017 10:04 am

Re: Shapiro-Wilk normality test comes up empty

Post by jonathon »

this is possibly a limitation of shapiro-wilk. from memory it can't handle very small, or very large data sets.

jonathon
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