RE: st: help on round function

[Fred Wolfe <fwolfe@arthritis-research.org>]

There is a Stata FAQ on precision: float versus double.

. gen y =7.995

. gen y2 =round(y,.01)

. di y2
7.9899998

. gen double y3 =round(y,.01)

. di y3
7.99

. gen double x=7.995

. gen double x3 =round(x,.01)

. di x3
8

The answer (in part) is that it depends on how your X variable is stored, 
either as a float or a double. Find the FAQ for further insight.


Fred


At 03:24 PM 12/10/2005, you wrote:

> Fred,
> I got that. But if I have a variable
> X
> 8.575
> 7.995
> 10.324
> and I do: gen y =round(x,.01), I get
> Y       not  Y
> 8.57    8.58
> 7.99    8.00
> 10.32   10.32
>
> what I need. What am I doing wrong?
>
> Thanks,
> Pinaki Mitra
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Fred Wolfe
> Sent: Saturday, December 10, 2005 3:44 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: help on round function
>
> At 01:26 PM 12/10/2005, you wrote:
> >Hello List,
> >
> >How do I use the round function to round off 8.755 to 8.76, 8.754 to
> >8.75?
>
>
> . di round(8.755,.01)
> 8.76
> [MITRA PINAKI ] 8
> . di round(8.754 ,.01)
> 8.75
>
> Fred Wolfe
>
> >Thanks,
> >Pinaki Mitra
> >
> >*
> >*   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/
>
>
> Fred Wolfe
> National Data Bank for Rheumatic Diseases
> Wichita, Kansas
> Tel (316) 263-2125     Fax (316) 263-0761
> fwolfe@arthritis-research.org
>
>
> *
> *   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/
>
> *
> *   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/

Fred Wolfe
National Data Bank for Rheumatic Diseases
Wichita, Kansas
Tel (316) 263-2125     Fax (316) 263-0761
fwolfe@arthritis-research.org


*
*   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/