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RE: st: iccvar


From   megan rossi <megan_rossi@msn.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: iccvar
Date   Thu, 13 Dec 2012 21:35:11 +1000

Thanks, however I am after the correlation coefficient from panel data, not the ICC.In other words I am looking for a command to use following xtmixed that will give me the the correlation coefficient for my dependent and independent variable. Any ideas?
Cheers,
 
Megan Rossi APD 
PhD Candidate School of Medicine, University of Queensland
Accredited Practicing Dietitian
Princess Alexandra Hospital Nutrition & Dietetic Department
m: 0402 931 441 | e: megan_rossi@msn.com 
"Let food be thy medicine and medicine be thy food." — Hippocrates (ca. 460 – 377 BC)
 
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> Date: Thu, 13 Dec 2012 11:47:13 +0100
> From: dirk.enzmann@uni-hamburg.de
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: iccvar
> 
> It seems that -quickicc- (from SSC) does *not* calculate the ICC of 
> random slope models. But you can use -xtmrho- (from SSC), instead - 
> although -xtmrho- does not calculate the standard error.
> 
> Stata example (runable from do-file window):
> 
> * --------------------------------------------
> cap which quickicc
> if _rc ssc install quickicc
> 
> cap which xtmrho
> if _rc ssc install xtmrho
> 
> webuse nlswork
> xtmixed ln_wage grade age c.age#c.age ttl_exp ///
> tenure c.tenure#c.tenure || idcode: tenure
> xtmrho
> quickicc
> * --------------------------------------------
> 
> BTW: Note that in the first "official" example for -xtmixed- (see -h 
> xtmixed-) the variables ln_wage and idcode are abbreviated to ln_w and 
> id which - depending on your varabbrev setting (see -h set_varabbrev-) 
> might give you an error message if you try to run it (this should be 
> corrected!).
> 
> Dirk
> 
> On Wed, 12 Dec 2012 09:03:45 -0700, "Robert 
> Fornango"<robert.fornango@f1analytics.com> wrote:
> 
> ---- <snip> --------------------
> >
> > As a final note on -iccvar-: please be aware that the command only estimates
> > the ICC for random intercept models, up to 4 levels. If you have a random
> > intercept and random slope model, you should use -quickicc-, also by Eric C
> > Hedberg.
> >
> ---- <snip> --------------------
> 
> ========================================
> Dr. Dirk Enzmann
> Institute of Criminal Sciences
> Dept. of Criminology
> Rothenbaumchaussee 33
> D-20148 Hamburg
> Germany
> 
> phone: +49-(0)40-42838.7498 (office)
> +49-(0)40-42838.4591 (Mrs Billon)
> fax: +49-(0)40-42838.2344
> email: dirk.enzmann@uni-hamburg.de
> http://www2.jura.uni-hamburg.de/instkrim/kriminologie/Mitarbeiter/Enzmann/Enzmann.html
> ========================================
> *
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