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st: Shapiro Francia for categorical variable - Royston (1993)


From   "Renzo Comolli" <renzo.comolli@yale.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Shapiro Francia for categorical variable - Royston (1993)
Date   Mon, 2 Dec 2002 00:19:27 -0500

Dear Statalist,

I would like to test that the log of income is normal.
I am familiar with -sfrancia- and -swilk-
But my variable (income) comes in categories 0-5000 5000-10,000 ... More
than 25,000

I read 
Patrick Royston "A Toolkit for Testing for Non-Normality in Complete and
Censored Samples" Statistician, Vol. 42, No. 1. (1993), pp. 37-43 
Which provides the solution from the theoretical point of view (although
you have to combine the case for groups with the case for the open ended
"more than").

Do you know whether anybody has implemented Royston's solution in an
.ado file?
I used -findit- but it does not look like it

Thank you in advance.
Sincerely,
Renzo Comolli

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