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st: egen index = group(X), label

From   "Airey, David C" <david.airey@Vanderbilt.Edu>
To   Statalist <>
Subject   st: egen index = group(X), label
Date   Thu, 26 Nov 2009 01:44:15 -0600

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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