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W-test for Normality

Select menu: Stats | Statistical Tests | W-test for Normality

The Shapiro-Wilk test assesses whether a sample of data comes from a Normal distribution. The output displays the statistic, W, with its probability value under the assumption that the data are Normal. So a low probability indicates that the data are unlikely to be from a Normal distribution.

  1. After you have imported your data, from the menu select 
    Stats | Statistical Tests | W-test for Normality.
  2. Double-click an item in the Available data field to move it into the Data field then click Run.

Available data

This lists data structures appropriate to the current input field. Double-click on a name to copy it into the input field, or type the name in directly.


A variate containing the sample of data to be tested.

Action buttons

Run Run the analysis.
Cancel Close the window.

Action Icons

Pin Controls whether to keep the dialog open when you click Run. When the pin is down  the dialog will remain open, otherwise when the pin is up  the dialog will close.
Restore Restore names into edit fields and default settings.
Clear Clear all fields and list boxes.
Help Open the Help topic for this dialog.

See also

Updated on March 25, 2019

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