[R-sig-ME] (no subject)

[Peter Paprzycki]

Perfect. Thank you. It is good to know that we can specify the
random-effects variance
equal to zero. Thanks.
Peter

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On Wed, Aug 1, 2018 at 10:57 PM, Ben Bolker <bbolker using gmail.com> wrote:

>
>   (please keep r-sig-mixed-models in the Cc:)
>
>   I'm pretty sure that lmer and lm models are commensurate, in case that
> helps.  Here's an example rigged to make the random-effects variance
> equal to zero, so we can check that the log-likelihoods etc. are identical.
>
> set.seed(101)
> dd <- data.frame(y=rnorm(20),x=rnorm(20),f=factor(rep(1:2,10)))
> library(lme4)
> m1 <- lmer(y~x+(1|f),data=dd,REML=FALSE) ## estimated sigma^2_f=0
> m2 <- lm(y~x,data=dd)
> all.equal(c(logLik(m1)),c(logLik(m2))) ## TRUE
> all.equal(fixef(m1),coef(m2))
> anova(m1,m2)
>
>
> On 2018-08-01 11:41 PM, Peter Paprzycki wrote:
> > Thank you. Oh, was just trying to compare my random-effects model to the
> > one where my grouping variable (schools) is treated as fixed.
> >
> > Peter
> >
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> >
> > On Wed, Aug 1, 2018 at 10:32 PM, Ben Bolker <bbolker using gmail.com
> > <mailto:bbolker using gmail.com>> wrote:
> >
> >
> >       I'm not 100% sure I understand the question, but I think the
> answer is
> >     "no": lmer cannot fit a model that doesn't contain any random
> effects.
> >     Perhaps you can give more context as to why it won't work for you to
> >     revert to lm() or plm() in these cases?
> >
> >     On 2018-08-01 11:30 PM, Peter Paprzycki wrote:
> >     > This is very basic, is there a way to specify in lmer function
> >     that I would
> >     > like to run my grouping variable as a fixed factor only, without
> >     reverting
> >     > to lm or plm functions. If one does not specify a random variable,
> >     one gets
> >     > the error message with lmer function; something that is equivalent
> >     to the
> >     > statement, "index = "grouping variable", model = "within"" with
> >     the plm
> >     > function.
> >     >
> >     >
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> >
> > --
> >
> > Peter Paprzycki, Ph.D.
> > Visiting Assistant Professor
> > Research Support Center Manager
> >
> > Educational Research and Administration
> > College of Education and Psychology
> > The University of Southern Mississippi
> > USM Box 5093; 118 College Drive
> > Hattiesburg, Mississippi 39406-0001
> > tel. (601)-266-4708
> > email: Peter.Paprzycki using usm.edu <mailto:Peter.Paprzycki using usm.edu>
> >
> >
> > Sidere mens eadum mutato
> >
>



-- 

Peter Paprzycki, Ph.D.
Visiting Assistant Professor
Research Support Center Manager

Educational Research and Administration
College of Education and Psychology
The University of Southern Mississippi
USM Box 5093; 118 College Drive
Hattiesburg, Mississippi 39406-0001
tel. (601)-266-4708
email: Peter.Paprzycki using usm.edu


Sidere mens eadum mutato

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