Thank you very much for all your answers!
Best
Mariarosaria
Citazione Maarten Buis <[email protected]>:
> Furthermore, calculating the sums in float format isn't as bad as it
> initially seems: the fact that Stata shows only 3 digits of precision has to
> do with the display format. The float is precise up to 8 digits, and is
> stored that way, as can be seen in the program below.
>
> *-------------------------example------------------
> drop _all
> input x
> 42224464
> 67090781
> end
>
> egen sum = sum(x)
> egen long sumlong = sum(x)
>
> list sum sumlong
>
> format sum %20.7g
>
> list sum sumlong
> *------------end example-----------------
>
> HTH,
> Maarten
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting adress:
> Buitenveldertselaan 3 (Metropolitan), room Z214
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Nick Cox
> Sent: maandag 28 november 2005 16:42
> To: [email protected]
> Subject: st: RE: generating a new variable with the egen command
>
> Your call should be
>
> egen double newvar = ...
>
> or
>
> egen long newvar = ...
>
> If these are integers, -long- is better. Either type
> is allowed by the syntax. See the help for -egen- once more.
>
> Nick
> [email protected]
>
> >[email protected]
> >
> > I'm trying to generate a new variable given by the sum of an
> > existing variable
> > by year (as I have 2 six month observations for the same
> > year) and individual.
> > The command is the following:
> > egen newvar=sum (oldvar), by(id year)
> >
> > the problem is that the original values are, for instance:
> > 42224464 and
> > 67090781, but the sum that STATA computes is 109000000,
> > instead of 109315245.
> > Why does it round like that?
> > The old variable is stored as "double", I have tried to
> > change the storage
> > type, using recast, but STATA does not allow to do it, as
> > many values would be
> > changed...
>
>
>
> *
> * 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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