Shapiro-Wilk W test
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Author:   Patrick Royston, Royal Postgraduate Medical School, London
Support:  FAX (011)-44-81-740 3119 or write.

	    ^swilk^ varlist [^if^ exp] [^in^ range] [^, l^nnormal ^q^uiet]

performs the Shapirio-Wilk W test and displays the number of observations, the
Shapiro-Wilk value W, V, the normal test z, and its signficance. 

If the ^lnnormal^ option is specified, the data are tested under the assumption
that they are of the form log(X-k), where k is a constant determined from the
data.  The data should be supplied already transformed to log(X-k).

It the quiet option is specified, all output is suppressed.  In addition to 
results being displayed, they are also stored in the macros ^%S_1^, ^%S_2^, etc.
Stored are:

	^%S_1^       number of observations
	^%S_2^       W
	^%S_3^       V
        ^%S_4^       Z
        ^%S_5^       P


Example
-------

	. ^swilk lchol^

tests the variable ^lchol^ for normality.

	. ^swilk lchol, lnnormal^

tests the variable ^lchol^ for 3-parameter lognormality.