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Shapiro-Wilks Test


What is it?


For relatively small datasets (n<= 2,000), Shapiro-Wilk's test is used to examine the level of 'normality' of a dataset, so how close to a perfect normal distribution it is. For any dataset which you are assuming is normally distributed it's W should be at or very close to 1. 

If you would like to test normality you should use the Kolmogorov-Smirnov test. 

How Do I Carry Out A W Test In SPSS?

When you have entered your data into SPSS offers a very simple way to carry out this test. Simply select ANALYZE, DESCRIPTIVE STATISTICS and finally, EXPLORE. Then choose the Plots option and tick "Normality plots".
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