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Re: st: bug in -xtile-


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: bug in -xtile-
Date   Fri, 1 Feb 2013 02:08:55 +0000

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)
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