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Re: AW: st: AW: lincom


From   Nikolaos Pandis <npandis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: AW: st: AW: lincom
Date   Thu, 18 Jun 2009 13:40:54 -0700 (PDT)

Thank you Martin.

This link is a good start.

Nick

--- On Thu, 6/18/09, Martin Weiss <martin.weiss1@gmx.de> wrote:

> From: Martin Weiss <martin.weiss1@gmx.de>
> Subject: AW: st: AW: lincom
> To: statalist@hsphsun2.harvard.edu
> Date: Thursday, June 18, 2009, 5:59 PM
> 
> <> 
> 
> You want to check out http://www.stata.com/support/faqs/stat/test1.html
> before proceeding...
> 
> 
> HTH
> Martin
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]
> Im Auftrag von Nikolaos Pandis
> Gesendet: Donnerstag, 18. Juni 2009 16:53
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: AW: lincom
> 
> Dear Martin,
> 
> Thank you for the posting. I apologize for being unclear
> and also because I
> am asking very basic questions. 
> 
> I am not sure I understand the purpose of this command
> after let's say a
> linear  regression.
> 
> Let's say we have:
> 
> xi: regress continvar i.catvar with 3 levels
> 
> the regression  table will show levels 2 and 3 and
> compare them with the
> reference level 1 of the categorical variable. Why would
> you run the lincom
> command. I am not sure I understand its purpose. Would you
> be able to
> compare level 2 with level 3 with the lincom command?
> 
> Regarding the anova post hoc I meant the following:
> 
> If I do a one-way ANOVA like below:
> 
> oneway continvar catvar, scheffe
> 
> I would get the an F-value and p-value which will be
> telling me whether
> there is a sig. difference between any of the category
> levels, whereas the
> -scheffe- option will do the "post hoc"- pairwise
> comparisons between the
> groups 1&2, 1&3 and 2&3 and tell me which
> groups are actually different.
> 
> Are the objectives of the lincom command similar the 
> scheffe option in the
> above examples? Do I have it all wrong? 
> 
> Thank you very much.
> 
> Nikolaos
> --- On Thu, 6/18/09, Martin Weiss <martin.weiss1@gmx.de>
> wrote:
> 
> > From: Martin Weiss <martin.weiss1@gmx.de>
> > Subject: st: AW: lincom
> > To: statalist@hsphsun2.harvard.edu
> > Date: Thursday, June 18, 2009, 4:23 PM
> > 
> > <> 
> > 
> > What exactly is a "post hoc" test? Apart from that,
> the
> > help file for
> > -lincom- does a good job under "Description". What
> else do
> > you want to know
> > about the command?
> > 
> > Note that -lincom- works after any estimation command,
> so
> > the -regress- case
> > may not be as special as you think...
> > 
> > 
> > 
> > HTH
> > Martin
> > 
> > -----Ursprüngliche Nachricht-----
> > Von: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu]
> > Im Auftrag von Nikolaos Pandis
> > Gesendet: Donnerstag, 18. Juni 2009 14:46
> > An: statalist@hsphsun2.harvard.edu
> > Betreff: st: lincom
> > 
> > Hi,
> > 
> > I would like to ask if you would possibly direct me to
> a
> > site/article ect
> > that explains in detail the use and meaning of the
> -lincom-
> > command (after
> > -regress-).
> > 
> > How is this command related (if it is related) with
> the
> > anova post hoc
> > tests.
> > 
> > Thank you very much.
> > 
> > Nick
> > 
> > 
> >       
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