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# Re: st: cutpoints for deciles

 From "Fabian Schönenberger" To statalist@hsphsun2.harvard.edu Subject Re: st: cutpoints for deciles Date Tue, 10 Jul 2012 15:33:54 +0200

```Many thanks!

-------- Original-Nachricht --------
> Datum: Tue, 10 Jul 2012 15:03:17 +0200
> Von: Maarten Buis <maartenlbuis@gmail.com>
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: cutpoints for deciles

> On Tue, Jul 10, 2012 at 2:48 PM, "Fabian Schönenberger" wrote:
> > Is it possible to loop over years?
> >
> > forvalues t = 1976/2012 {
> >> sum x if year=`t', meanonly
> >> gen x_cat = (x - r(min)) / (r(max)-r(min)) x if year=`t'
> >> replace x_cat = ceil( 10 * x_cat) x if year=`t'
> > }
> >
> > How do I have to adjust the formula to generate 5 bins?
>
> *------------ begin example --------------
> // create some panel data
> clear
> set obs 37
> gen year = 1975+_n
> expand 10
> gen x = rnormal()
>
> // create the bins by year
> sort year
> by year : egen min = min(x)
> by year : egen max = max(x)
>
> gen x_std = ( x - min) / ( max - min )
> gen x_10cat = ceil(10 * x_std)
> gen x_5cat  = ceil( 5 * x_std)
>
> // deal with the minimun
> replace x_10cat = 1 if x_10cat == 0
> replace x_5cat  = 1 if x_5cat  == 0
>
> // display
> list in 1/25, sepby(year)
> *----------- end example -----------------
> (For more on examples I sent to the Statalist see:
> http://www.maartenbuis.nl/example_faq )
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
>
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```