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| From | "Sun, Wensheng" <wsun@bcm.edu> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | RE: st: marginsplot after xtmixed with square term |
| Date | Wed, 13 Mar 2013 20:55:23 -0500 |
Hi Scott, It works. By the way, could you explain what "i.pressure c.repl##c.repl##i.pressure" means? Thank you very much! Wensheng ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Scott Merryman [scott.merryman@gmail.com] Sent: Wednesday, March 13, 2013 8:09 PM To: statalist@hsphsun2.harvard.edu Subject: Re: st: marginsplot after xtmixed with square term Stata does not know that repl2 is the square of repl. Try: webuse acmemanuf lowess y repl, by(pressure) //gen repl2=repl^2 gen id=. replace id=temp if pressure==1 replace id=temp+3 if pressure==2 replace pressure=0 if pressure==1 replace pressure=1 if pressure==2 xtmixed y i.pressure c.repl##c.repl##i.pressure || id: repl, cov(uns) res(ind) mle variance margins pressure, at(repl=(1(1)10)) marginsplot Scott On Wed, Mar 13, 2013 at 12:43 PM, Sun, Wensheng <wsun@bcm.edu> wrote: > Please help! Marginsplot after xtmixed model contend square-term (wish to get concaved curves instead of straight lines). > webuse acmemanuf > lowess y repl, by(pressure) > gen repl2=repl^2 > gen id=. > replace id=temp if pressure==1 > replace id=temp+3 if pressure==2 > replace pressure=0 if pressure==1 > replace pressure=1 if pressure==2 > xtmixed y c.repl## i.pressure c.repl2##i.pressure || id: repl, cov(uns) res(ind) mle variance > margins pressure, at(repl=(1(1)10)) > marginsplot > > I expected to get concaved curves from marginsplot like I usually got from modeling estimates with square terms; however, what I got here were two straight lines. Please help me to fix my codes. > > Thank you very much! > > Wensheng > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/