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st: Re: strange behavior using round function


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: strange behavior using round function
Date   Tue, 12 Sep 2006 14:32:43 -0400

Apparently 80.54 can not be held exactly in binary double precision. Try -search precision- and follow some of the links. If you really just want to display the result, use the formating available with display:

displ %6.2f `t2_y'

Otherwise, you may want to read some of the related faqs.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- From: "Nicola Tommasi" <nicola@cide.univr.it>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, September 12, 2006 12:08 PM
Subject: st: strange behavior using round function



hi all,

I would appreciate if someone could help me understand why the ROUND function behaves so differently when calculating t1_y and t2_y
The result for t2_y should be 80.54
Below follows the code.

Thanks

Sincerely,

Nicola Tommasi



. matrix list mati;

mati[2,2]
c1 c2
r1 818 1535
r2 248 371

. di "`tot1'";
1066

. di "`tot2'";
1906

. local t1_y = round(mati[1,1]/`tot1'*100, 0.01);

. local t2_y = round(mati[1,2]/`tot2'*100, 0.01);

. di "`t1_y'";
76.74

. di "`t2_y'";
80.54000000000001





______________________________________________________________
dott. Nicola Tommasi
Centro Interdipartimentale di Documentazione Economica (C.I.D.E)
University of Verona
via dell'Artigliere, 19
37129 Verona (Italy)
tel.: +39-045-8028048
fax.: +39-045-8028047
_______________________________________________________________________

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