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Re: st: question on datatypes


From   Keith Dear <keith.dear@anu.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: question on datatypes
Date   Thu, 20 Oct 2005 16:24:19 +1000

Hi Florence,
It seems to work ok if you declare the non-decimal version as a "long" (integer).
KD

. version
version 8.2
. clear
. input double x
x
1. 150.089873
2. end
. format x %10.6f
. gen long y=x*1e6
. describe
Contains data
obs: 1
vars: 2
size: 16 (99.9% of memory free)
-------------------------------------------------------------------------------
storage display value
variable name type format label variable label
-------------------------------------------------------------------------------
x double %10.6f
y long %12.0g
-------------------------------------------------------------------------------

. list, clean
x y
1. 150.089873 150089873

At 03:09 PM 20/10/05, you wrote:

Hello, I have a question, I have variables that are coded in as 2-3 digits and 6 decimal places after that, e.g. 150.089873 and I want to convert this to get rid of the decimal places so it looks like 150089873 but when I just multiply by 1000000 then it keeps storing it as a "float" display i.e. 1.5E8 and more than that, the last decimal places are actually INCORRECT in the new version...it will say 1.50089875 instead...which is INCORRECT. I am using Stata 8 and that is where this problem occurs. I was wondering what the easiest way is to change datatypes that something is input in so that it will not be a problem.
Thanks,
florence
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==========================================================
Dr Keith B.G. Dear
Senior Fellow in Biostatistics
National Centre for Epidemiology and Population Health (NCEPH)
The Australian National University
Canberra, ACT 0200, Australia
Tel: 02 612 54865, Fax: 02 612 50740
http://nceph.anu.edu.au/Staff_Students/staff_pages/dear.php
CRICOS provider #00120C

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