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From |
"Maarten Buis" <M.Buis@fsw.vu.nl> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Mon, 28 Nov 2005 16:56:36 +0100 |

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/

**Follow-Ups**:**Re: st: RE: RE: generating a new variable with the egen command***From:*agostino@unical.it

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