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st: Unpublicized changes to Saved Results for -reshape-


From   Roger Newson <r.newson@imperial.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Unpublicized changes to Saved Results for -reshape-
Date   Mon, 26 Apr 2010 13:08:02 +0100

Fellow Statalisters (especially StataCorp):

I have noticed some recent unpublicized changes to the Saved Results for the -reshape- command (see -help reshape-). In my Stata 11.0 (which I updated today to the sub-version dated 20 April 2010), the -reshape- command produces a selection of returned dataset characteristics that is different from the selection advertized in -help reshape-. In particular, if I use -reshape wide-, then the advertized result -_dta[ReS_jv]- (containing the values of the variable specified by the -j()- option) is no longer stored. On the other hand, if the variable specified by the -j()- option had a value label, then -reshape- saves the unpublicized results -_dta[__JValLabName]-, containing the name of the value label, and -_dta[__JValLab]-, containing the values of the -j()- variable alternating with the corresponding value labels.

The changes have the appearance of being work in progress, and, when complete, will probably extend the capabilities of -reshape- in ways which will be useful to users like me, who frequently use -reshape- to produce tables with multiple columns of confidence intervals (see Section 4.4 of Newson, 2003). However, the selection of results seems currently to be unstable, implying that it is currently not a good idea for users to use these saved results in their own programs. Are these results likely to stabilize soon? If not, then it is probably a good idea for users to avoid using these results for the time being, and to make their own solutions. (I currently often use Ben Jann's very useful -labelsof- package, downloadable from SSC, when I want to store values and labels of -j()- variables when using -reshape wide-.)

Best wishes

Roger


References

Newson R. 2003. Confidence intervals and p-values for delivery to the end user. The Stata Journal 3(3): 245-269. Download from
http://www.stata-journal.com/article.html?article=st0043


--
Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.
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