lme4 and confidence intervals - R-SIG-mixed-models

Wed, Oct 23, 2013 12:04 PM #

This works for me with the development version of lme4 (although I do
get some warnings about cov2cor() that have been referenced on another
recent thread, and the confidence intervals for the Insitution RE are
not getting calculated).  I strongly suspect it will also work with the
release version, although I haven't tested it.

  Can you start with a clean session and give the results of
sessionInfo() ??

On 13-10-23 01:03 PM, Nicholas Mitsakakis wrote:

Hi Ben,

I am attaching a dataset, brazil. The code I used is

I <- which(as.numeric(brazil$state) == 1 & as.numeric(brazil$drug) == 1)
modref2 <- lmer(log.Std.Unit.Price ~ 1 + (1|Institution) + (1|supplier)
+ log(Quantity) + as.numeric(Date), brazil, subset = I)
confint(modref2)


Please let me know if you are getting the same problem.

Thanks a lot,
Nicholas




On Wed, Oct 23, 2013 at 12:51 PM, Ben Bolker <bbolker at gmail.com
<mailto:bbolker at gmail.com>> wrote:

     [cc'ing to r-sig-mixed models]

      This doesn't happen for me: I would need a reproducible example in
    order to be able to see what's going on.

       sincerely
       Ben Bolker


    On 13-10-23 12 <tel:13-10-23%2012>:31 PM, Nicholas Mitsakakis wrote:

    > Hello Bob,
    >
    > I want to get the (or some) confidence intervals for the coefficients
    > from a mixed effects model fitted by the lmer function. I noticed

    in the

    > lme4 documentation that confint function can do this but it does not
    > work for me giving errors messages:
    >
    > Error: $ operator not defined for this S4 class
    >
    > I have installed the most recent version of lme4 from CRAN.
    >
    > Am I missing something?
    >
    > I would appreciate it if you could let me know.
    >
    > Regards,
    > nicholas
    >
    > --
    > Nicholas Mitsakakis, MSc, PhD
    > Biostatistician
    > Toronto Health Economics and Technology Assessment (THETA)

    Collaborative

    > Assistant Professor
    > Leslie Dan Faculty of Pharmacy, University of Toronto
    > 6th Floor, Room 641
    > 144 College Street
    > Toronto ON, M5S 3M2
    > e: n.mitsakakis at theta.utoronto.ca

    <mailto:n.mitsakakis at theta.utoronto.ca>
    <mailto:n.mitsakakis at theta.utoronto.ca
    <mailto:n.mitsakakis at theta.utoronto.ca>>

    > t: (416) 946 - 3700 <tel:%28416%29%20946%20-%203700>
    > f: (416) 946 - 3719 <tel:%28416%29%20946%20-%203719>
    > w: www.theta.utoronto.ca <http://www.theta.utoronto.ca>

    <http://www.theta.utoronto.ca>




-- 
Nicholas Mitsakakis, MSc, PhD
Biostatistician
Toronto Health Economics and Technology Assessment (THETA) Collaborative
Assistant Professor
Leslie Dan Faculty of Pharmacy, University of Toronto
6th Floor, Room 641
144 College Street
Toronto ON, M5S 3M2
e: n.mitsakakis at theta.utoronto.ca <mailto:n.mitsakakis at theta.utoronto.ca>
t: (416) 946 - 3700
f: (416) 946 - 3719
w: www.theta.utoronto.ca <http://www.theta.utoronto.ca>