Shapiro-Wilk normality test comes up empty

Discuss the jamovi platform, possible improvements, etc.

by tkemeny » Fri Mar 26, 2021 2:14 pm

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.

Screenshot 2021-03-26 at 14.13.58.png
screengrab
Screenshot 2021-03-26 at 14.13.58.png (112.92 KiB) Viewed 1568 times


Any thoughts about what might be happening here?

Thanks
Tom
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by jonathon » Fri Apr 02, 2021 10:01 pm

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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