Re: st: Unexpected error from -merge-

[Stas Kolenikov <skolenik@gmail.com>]

The missing values on the ID variable may also throw things off.

-- Stas Kolenikov, PhD, PStat (ASA, SSC)
-- Senior Survey Statistician, Abt SRBI
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer
-- http://stas.kolenikov.name



On Mon, Sep 23, 2013 at 10:20 AM, Jacob-Jan Koopmans
<jacob-jan.koopmans@student.uva.nl> wrote:
> Dear list members,
>
> I am receiving an unexpected error when merging data.
> I am using stata 12.
>
> I am trying to merge data in the following way:
> "sort actpsid
> merge 1:m actpsid using "cbhiind" ".
>
> This, however, results in the following error:
> "variable actpsid(my individual identifier) does not uniquely identify
> observations in the master data
> r(459)."
> This would normally suggest(as far as I know), there are duplicates of
> actpsid in the master data. However, when checking for duplicates by
> using: duplicates report. I receive the following nice report:
>
> "Duplicates in terms of all variables
> --------------------------------------------------------
>    copies | observations       surplus
> ----------+--------------------------------------------
>         1 |         8772             0
> --------------------------------------------------------"
>
> Therefore, I suppose the error is not resulting from duplicates in my
> identifier variable.
>
> I would thus like to ask whether there are other reasons why the above
> mentioned error appears.
>
> Kind regards,
> Jacob-Jan Koopmans
> *
> *   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/
*
*   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/