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From |
agostino@unical.it |

To |
statalist@hsphsun2.harvard.edu, Maarten Buis <M.Buis@fsw.vu.nl> |

Subject |
Re: st: RE: RE: generating a new variable with the egen command |

Date |
Mon, 28 Nov 2005 16:43:15 +0100 |

Thank you very much for all your answers! Best Mariarosaria Citazione Maarten Buis <M.Buis@fsw.vu.nl>: > 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: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Nick Cox > Sent: maandag 28 november 2005 16:42 > To: statalist@hsphsun2.harvard.edu > 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 > n.j.cox@durham.ac.uk > > >agostino@unical.it > > > > 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/ > ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ * * 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/

**References**:**st: RE: RE: generating a new variable with the egen command***From:*"Maarten Buis" <M.Buis@fsw.vu.nl>

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