thank you very much,it works
sara
--- Scott Merryman <[email protected]> ha scritto:
> Something like this?
>
> clear
> input group x
> 1 -5
> 1 -10
> 1 32
> 1 45
> 1 76
> 2 -9
> 2 24
> 2 32
> end
>
> egen neg = total(x<0), by(gro)
> sum neg, meanonly
> sort group
> forv i = 1/`=r(max)' {
> by group: gen ab`i' = abs(x) if x < 0 & _n == `i'
> }
> drop neg
> l
>
>
> Scott
>
>
> > -----Original Message-----
> > From: [email protected]
> [mailto:owner-
> > [email protected]] On Behalf Of sara
> borelli
> > Sent: Thursday, April 12, 2007 3:46 PM
> > To: [email protected]
> > Subject: st: creating different varibles in a loop
> depending on the values
> > of x
> >
> > Dear Statalist members,
> >
> > I have the following question:
> >
> > group x
> > 1 -5
> > 1 -10
> > 1 32
> > 1 45
> > 1 76
> > 2 -9
> > 2 24
> > 2 32
> >
> > Whithin each group, I would like to create two
> > variables that take the absolute value of x when x
> is
> > negative, that is I would like to obtain:
> >
> > group x absx1 absx2
> > 1 -5 5 .
> > 1 -10 . 10
> > 1 32 . .
> > 1 45 . .
> > 1 76 . .
> > 2 -9 9 .
> > 2 24 . .
> > 2 32 . .
> >
> > I have manually typed:
> > bysort group: gen absx=abs(x) if x <0 & _n==1;
> > bysort group: gen absx=abs(x) if x <0 & _n==2;
> >
> > since the number of negatives varies depending on
> the
> > situation, does anyone know how to write that in a
> > loop, so that it cretaes automatically different
> absx
> > depending on the numer of negatives present in the
> > data?
>
>
>
> *
> * For searches and help try:
> *
> http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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*
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