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st: RE: Problem with "real" command


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Problem with "real" command
Date   Wed, 29 Jun 2011 13:24:36 +0100

This is not a problem with the -real()- function at all. The problem lies in your use by default of a -float- variable type. 

You need to use a more appropriate storage type, e.g. -double-, to avoid precision problems. 

. gen double numven6=real("600010154088")

. format numven6 %18.0f

. l numven6 in 1

     +--------------+
     |      numven6 |
     |--------------|
  1. | 600010154088 |
     +--------------

-search precision- for many sources of further information. 

Nick 
n.j.cox@durham.ac.uk 

Jérôme Fauconnier

When I  use the "real" function with large numbers, I have random results as  :

command :
gen numven6=real("600010154088")

i get the following result :

numven6=600010129408

Have anybody had the same problem?

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