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st: RE: egen index = group(X), label


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: egen index = group(X), label
Date   Thu, 26 Nov 2009 10:25:54 -0000

A gloss on David's trick is as follows. -egen, group()- always produces
integers 1 up. Thus you need only find the highest such integer. You can
also cut out the middle macro(s). 

egen index = group(X), label
summ index, meanonly 
gr tw (scatter Y index, xlabel(1/`r(max)', val))

Nick 
n.j.cox@durham.ac.uk 

Airey, David C

Suppose you have an index plot to make for Y against X, but X is not
like:

1,2,3,4,5,6,7,8,9,10 (1)

but like

1,8,9,13,18,120,140,141,142,300 (2)

If you try -scatter Y X- the gaps in X make it unattractive for some
purposes. But you can instead try:

egen index = group(X), label
summ index
local xlo = r(min)
local xhi = r(max)
gr tw (scatter Y index, xlabel(`xlo'(1)`xhi', val))

Now the X axis will be as (1) but labeled as (2).

A useful little note in egen rank() for group() in the PDF help
suggested this trick.

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