[R] t.test or wilcox.test?

[stephen sefick]

Try both of them and see if they jive.

On Mon, Jun 15, 2009 at 6:03 PM, Serebrenik, A.<a.serebrenik at tue.nl> wrote:
> Dear all,
>
> I have two samples that I need to compare. Running Shapiro Wilk normality test does not allow me to reject the normality assumption neither for the first sample (p-value = 0.8938) not for the second one (p-value = 0.07905). So the t.test seems to be applicable. However, the p-value for the second sample seems to be quite close to 0.05 threshold, so wouldn't it be better to use a non-parametric test such as wilcox.test?
>
> Best regards and thanks in advance,
> Alexander
>
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-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
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annoying little problems of being mammals.

								-K. Mullis