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st: re: different result everytime - something strange


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: different result everytime - something strange
Date   Sat, 21 Jun 2008 07:34:59 -0400

< >

Re my last posting, apologies to Philippe: he did indeed mention - adoupdate- in his posting, which I read WBOC*. Let me just clarify what I said about that routine to indicate why it did not ultimately solve the problem. If you do -findit glcurve- you find six references to the SJ and STB-published forms of this routine, most recently updated in SJ 7:2. You also find references to the SSC version of the routine (dated 20070216) and a version presented at the 5th UK SUG meetings (which was, as it happens, a very long time ago as this year's meeting will be #14).

The general problem, as people smarter than me have concluded, is insoluble by artificial intelligence. There is no constraint that causes a particular SSC package to be coincident with the contents of a particular SJ package. For instance, we may have package -zorch- which contains zorch.ado, zorch.hlp, foo.ado and foo.hlp accompanying an article in the 2007 Stata Journal. The SSC archive may contain two packages -- zorch, with only the zorch files, and foo, with only the foo files. The zorch package on SSC dates from 2006; the foo package was updated in 2008 (hypothetically). What should -adoupdate- do? Programmers may argue that this could be solved with makefiles, but that requires a great deal of information available to such a facility (for instance, there is a modification date on each SSC package, but not on each included file).

For -glcurve-, as the SSC package dates from 2007 and the SJ package dates from 2007, there is no substitute for manual examination of the headers of each ado-file, in the hopes that the authors have given a version number that allows you to conclude that one is a later version (or, perhaps, that they are the same version).

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html

*: Without Benefit of Caffeine
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