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...othesis - that the data is normally distributed? What does the p-value tell me? 65.55% chance of what - getting W-statistic greater than or equal to 0.9513 (I picked this up from the Dalgaard book, Introductory Statistics with R, but its not really sinking in with respect to how it applies to a Shipiro Wilk test).? The method description - retrieved using ?shapiro.test() - is a bit light on details. Thanks much. ------------------------------------- Matthew C. Findley, CPSSc Environmental Scientist CH2M HILL mfindley at ch2m.com