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Re: st: cutpoints for deciles

From   Maarten Buis <>
Subject   Re: st: cutpoints for deciles
Date   Tue, 10 Jul 2012 14:14:55 +0200

On Tue, Jul 10, 2012 at 1:44 PM, "Fabian Schönenberger" wrote:
> My goal is to assign each company to a decile according to its market capitalization on a yearly basis. Instead of forming equally distributed portfolios with xtile2 (Stata module by Wang), I want the assignment based on 10 cutpoints of the market capitalization.
> For example: If in year 1 the smallest company is 200, the largest 2000, there are the following cutpoints: 200,380,560,740,920,1100,1280,1460,1640,1820,2000. A company with market capitalization of 250 should be in portfolio 1, one with 1900 market capitalization in portfolio 10.

First of all, I would not call these deciles, you might call them bins.

Here is one solution:

*-------------- begin example --------------
input x

sum x, meanonly
gen x_cat = (x - r(min)) / (r(max)-r(min))
replace x_cat = ceil( 10 * x_cat)
*--------------- end example ---------------
(For more on examples I sent to the Statalist see: )

Also see: Nicholas J. Cox (2003) Stata tip 2: Building with floors and
ceilings. The Stata Journal, 3(4): 446-447.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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