Approximating the Shapiro-Wilk W-test for non-normality |
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| Authors: | Patrick Royston |
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| Affiliation: | (1) Department of Medical Physics, Royal Postgraduate Medical School, Ducane Rood, W12 0NN London |
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| Abstract: | A new approximation for the coefficients required to calculate the Shapiro-WilkW-test is derived. It is easy to calculate and applies for any sample size greater than 3. A normalizing transformation for theW statistic is given, enabling itsP-value to be computed simply. The distribution of the new approximation toW agrees well with published critical points which use exact coefficients. |
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| Keywords: | Non-normality Shapiro-WilkW-test |
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