[R] How to run Shapiro-Wilk test for each grouped variable?

Yvonnick Noel yvonnick.noel at uhb.fr
Mon Apr 12 09:56:51 CEST 2010

Dear Iurie,

> I want to run Shapiro-Wilk test for each variable in my dataset, each
> grouped by variable groupFactor.
Note that, at least on a single dependent variable with a grouping variable, a possible simplification may arise when homogeneity of variances is assumed and reasonable. You may want to do a single normality test on group-centered data :



Yvonnick Noel
University of Brittany, Rennes 2

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