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From | Stas Kolenikov <skolenik@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: SimpleSlopes in Multilevel Models |
Date | Sun, 5 Feb 2012 15:55:33 -0500 |
If -zpos- is a binary variable with values 0/1, then the relation for low levels is given by the coefficient itself, and for high levels, by lincom _b[ ZSchaufelishort ] + _b[ EExPOS ] which would invoke the covariance matrix behind the scenes. This can also be done with -margins-, and the corresponding plots, with -marginsplot-. On Sun, Feb 5, 2012 at 2:03 PM, Kerstin Alfes <KAlfes@gmx.de> wrote: > Thanks for the references, Cam. I will look into them! > > Stan, I would like to graph the interaction and also calculate whether the relationship between ZSchaufelishort and logperformance is significant for high and/or low levels of ZPOS. If there is a way to do this without the ACM, that would help a lot. > > Best wishes > Kerstin > > > -------- Original-Nachricht -------- >> Datum: Sun, 5 Feb 2012 10:21:14 -0500 >> Von: Stas Kolenikov <skolenik@gmail.com> >> An: statalist@hsphsun2.harvard.edu >> Betreff: Re: st: SimpleSlopes in Multilevel Models > >> On Sun, Feb 5, 2012 at 9:31 AM, Cameron McIntosh <cnm100@hotmail.com> >> wrote: >> > If you want to dissect the interaction effects further, yes you would >> need to estimate and test simple slopes, for which you would need the >> covariance between the main effect and interaction coefficients as you say. I >> don't know how to request the ACM in Stata, but tech support should be able to >> help you. >> >> I am pretty sure one won't need to try to get the covariance matrices >> (which are available as -e(V)-), as there is little you cannot do >> between -test-, -testnl-, -lincom- and -nlcom-. Matrix code will be >> ugly, and you need to master the convenience tools, anyway. What is >> involved in "estimating and testing simple slopes"? >> >> -- >> Stas Kolenikov, also found at http://stas.kolenikov.name >> Small print: I use this email account for mailing lists only. >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ > > -- > Kerstin Alfes > > Kettelerweg 24 > 57482 Wenden > Germany > Phone: +49-(0)2762-2766 > Mobile: +49-(0)174-160 15 44 > > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ -- Stas Kolenikov, also found at http://stas.kolenikov.name Small print: I use this email account for mailing lists only. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/