Shapiro Wilk test for Normality

Irvine_audit wrote:

Sorry to dig this up.

But is there any chance, that this widely-used Test may be implemented in any future Igor version?

For v.8, does functionality exist for alpha values other than the default, which I assume is 0.05?  If not (yet) is there a dirty way in which to effect this?

I think there is a misunderstanding here that may be due to the examples in the documentation.  The test as implemented returns two values: V_statistic and V_prob.  At this point there is no assumption about alpha.

After you execute the operation you compare V_prob to the desired alpha value and if V_prob<alpha you reject the null hypothesis that the population is normally distributed.  I see no point in adding an alpha input to perform the test V_prob<alpha.

The examples in the documentation are somewhat extreme in that p=0.846139 is simply likely to be larger than any practical value one might use for alpha and p=1.7979e-05 is likely smaller than typical alpha values.

A.G.