It would be hlpeful if you provided the SAS code used.
> > -----Original Message-----
> > From: email@example.com
> > [mailto:firstname.lastname@example.org] On
> Behalf Of
> > Goerner, Thomas
> > Sent: Friday, April 22, 2005 9:08 AM
> > To: email@example.com
> > Subject: st: Stata v. SAS OLS
> > Hi,
> > I am having some trouble trying to match OLS
> > output done in SAS to a OLS regression done in
> > Basically, I was given a SAS program, and when run
> on SAS, it
> > produces the exact results we are looking for.
> However, I'm
> > trying to "convert" it into a STATA program. The
> > itself appends and merges a number of datasets,
> creates some
> > variables from the final merged dataset using some
> > arithmetic commands, drops certain observations,
> and then
> > runs a OLS regression on certain variables. It is
> really not
> > all that complex of a program, but I cannot for
> the life of
> > me get my STATA regression results to match the
> SAS results.
> > This is made even more bizarre by how similar the
> > datasets appear to be. All of the summary
> statistics (i.e.
> > mean, std. Dev., max, min, number of observations)
> > identical in both programs. Moreover, I generated
> an "id"
> > variable that simply numbers the observations in
> the first
> > (and largest dataset) in both programs, and after
> all the
> > datasets are merged and transformed, both datasets
> > the exact same observations from that first
> dataset (e.g. the
> > id variables from both programs are identical).
> When I run
> > the regressions in STATA, the coefficients for the
> > all come very, very close, if not exactly the same
> as the
> > coefficients in SAS. The only exception to this
> is the
> > constant, which bizarrely is nearly 100 times
> larger than the
> > constant in SAS. And I cannot figure out why!
> Does anyone
> > know what would cause supposedly identical
> datasets to
> > produce such different results in the constants?
> I have a
> > pocket theory that it is because the programs
> treat blanks
> > and zeros differently, but I have been unable to
> prove it,
> > and the problem could very well be something else.
> If anyone
> > can offer any help, I would greatly appreciate it!
> > Thanks.
> > Thomas
> > _______________________________
> > Thomas Goerner
> > NERA White Plains
> > 50 Main St.
> > White Plains, NY 10606
> > Tel: 1-914-448-4009
> > Fax: 914-448-4040
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Scott R Millis, PhD, MEd, ABPP (CN & RP)
Director of Research - Dept of PM&R
Wayne State University School of Medicine
Rehabilitation Institute of Medicine
261 Mack Blvd
Detroit, MI 48201
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