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| From | "Dr. Yu Chen" <profyuchen@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: bug in -xtile- |
| Date | Thu, 31 Jan 2013 21:21:56 -0600 |
Nick, if this is -xtile- point of view, then it will not work if I delete observations whose value<5000. See my code below. In other words, in the first example I added an if condition, and in the second example, I deleted those observations. Why is the result different? I think this is an inconsistency in -xtile-. sysuse auto,clear keep in 1/10 drop if price<5000 xtile decile=price , nq(10) On Thu, Jan 31, 2013 at 8:08 PM, Nick Cox <njcoxstata@gmail.com> wrote: > In your example 6 values qualify as < 5000. -xtile- classifies into 10 > classes as best it can > > (Here -groups- is from SSC.) > > . groups price decile, sep(0) > > +----------------------------------+ > | price decile Freq. Percent | > |----------------------------------| > | 3,799 1 1 16.67 | > | 4,082 2 1 16.67 | > | 4,099 4 1 16.67 | > | 4,453 6 1 16.67 | > | 4,749 7 1 16.67 | > | 4,816 9 1 16.67 | > +----------------------------------+ > > You seem to be saying that they should not be classified if there are > less than 10. That's a point of view, but it is not -xtile-'s point of > view. > > The values are of the new variable are not equally spaced integers, > but they could not be given the request. > > Nick > > On Fri, Feb 1, 2013 at 1:45 AM, Dr. Yu Chen <profyuchen@gmail.com> wrote: >> I think there is a bug in -xtile-. I ran the code below, and I still >> got deciles, but they are incomplete. I would expect missing values >> because there are not enough observations. >> I use Stata 12. >> >> sysuse auto,clear >> keep in 1/10 >> xtile decile=price if price<5000, nq(10) > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- Yu Chen, Ph.D. Assistant Professor of Accounting A. R. Sanchez, Jr. School of Business, WHTC 218D Texas A&M International University 5201 University Boulevard Laredo, Texas 78041-1900 USA 956-326-2513 (office) 956-326-2479 (fax) * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/