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From |
"Joseph Coveney" <stajc2@gmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: Re: xtmixed with log-transfered dependent variable: back to non-log on margins and marginsplot |

Date |
Mon, 15 Apr 2013 12:11:00 +0900 |

Wensheng Sun wrote: Thank you for the suggetion of log link and gllamm. I am new to gllamm. The following is the error message when I was trying gllamm. Please let me know how should I fix that. Thank you very much! [snip] -------------------------------------------------------------------------------- The user-written command -gllamm- pre-dates the introduction of factor variables in Stata, and so it doesn't recognize the factor-variable syntax that you typed. Prior to factor variables, Stata used the command -xi- to manually create regression terms for categorical variables and their interactions. The command -xi- is still around for use with those commands that do not allow factor-variable notation. I show its use with -gllamm- below for the model that you tried to fit. Your syntax for -gllamm- seems to be some kind of hodgepodge of that for -xtmixed- and -gllamm-. As others have mentioned, you're probably better off referring to the user's manual for -gllamm-, which can be downloaded from the website shown in the command's help file. Joseph Coveney . clear * . set more off . set linesize 80 . webuse childweight (Weight data on Asian children) . xi i.girl*age i.girl _Igirl_0-1 (naturally coded; _Igirl_0 omitted) i.girl*age _IgirXage_# (coded as above) . generate byte k = 1 . eq cons: k . eq age: age . gllamm weight age _Igirl_1 _IgirXage_1, i(id) nrf(2) eqs(cons age) family(gaus > sian) link(log) adapt nolog number of level 1 units = 198 number of level 2 units = 68 Condition Number = 9.3286288 gllamm model log likelihood = -369.79782 ------------------------------------------------------------------------------ weight | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- age | .3312893 .0187497 17.67 0.000 .2945405 .368038 _Igirl_1 | -.0874049 .0484338 -1.80 0.071 -.1823335 .0075236 _IgirXage_1 | .0047005 .0276294 0.17 0.865 -.0494521 .0588531 _cons | 1.82589 .0329648 55.39 0.000 1.76128 1.8905 ------------------------------------------------------------------------------ Variance at level 1 ------------------------------------------------------------------------------ 2.0966596 (.2469165) Variances and covariances of random effects ------------------------------------------------------------------------------ ***level 2 (id) var(1): .00263901 (.00311924) cov(2,1): .00065959 (.00057154) cor(2,1): 1 var(2): .00016486 (.00043059) ------------------------------------------------------------------------------ * * 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/

**Follow-Ups**:**st: RE: Re: xtmixed with log-transfered dependent variable: back to non-log on margins and marginsplot***From:*"Sun, Wensheng" <wsun@bcm.edu>

**References**:**st: RE: Re: xtmixed with log-transfered dependent variable: back to non-log on margins and marginsplot***From:*"Sun, Wensheng" <wsun@bcm.edu>

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