# Performing a Shapiro-Wilk test on the normality of differences between two columns

A Shapiro-Wilk test can indicate whether the difference between two columns appears to be follow a normal (Gaussian) distribution.

To perform a Shapiro-Wilk test on the differences between two columns:

1. In the , use the confidence slider to choose a desired confidence level
2. Command-click two numeric columns of interest on the left
3. Click the Configure button below the Covariate view
4. Check the box labeled Show Paired Differences in the pop-over that appears
5. Click the button labeled Q-Q plot below the Covariate view
6. The result of the Shapiro-Wilk test will appear in the Bottom Line

Shapiro-Wilk tests are only supported with 5,000 or fewer observations.

See also:

- Performing a Shapiro-Wilk test of normality on a numeric column
- Viewing a Q-Q plot of a numeric column against a normal or uniform distribution
- Summing, multiplying, and dividing numeric columns
- Formatting descriptive and inferential statistics
- About the Summary view

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