false convergence of lmer model

Dear all,

To determine the effect of weather parameters on the amount of core areas
of mallards (71 different mallards with measurements on several days), I'm
trying to fit the following model to my data:

model1 <- lmer(Core_areas  ~ c_MaxTemp + I(c_MaxTemp^2) + c_MinTemp + I(
c_MinTemp^2) + c_GemTemp + I(c_GemTemp^2) + c_D.rain + c_S.rain + c_Gemwind +
c_Hwind + c_Lwind + (1 | Mallard)   # random slope | random factor (here
individual is random factor), family = poisson)

But then I get the following warning message:

In mer_finalize(ans) : false convergence (8)
What consequences does this have? And had anybody an idea how I can solve
this??

Best,

Tara

Hi Ben,

That sounds great, but I got the same error as Neil when entering the
installation code.

Tara

2013/7/24 Neil Collier <neilandertal at gmail.com
<mailto:neilandertal at gmail.com>>

    Hi Ben,

    I think there is a typo in the installation code for lme4 from github:

    install.packages("lme4",
    repos=c("http://lme4.r-forge.r-project.org/repos",
    getOptions("repos")["CRAN"]))

    Message from R:

    install.packages("lme4",
    repos=c("http://lme4.r-forge.r-project.org/repos",
    getOptions("repos")["CRAN"]))
    Error in install.packages("lme4", repos = c("
    http://lme4.r-forge.r-project.org/repos",  :
      could not find function "getOptions"

    getOption not getOptions works.

    Cheers,

    Neil


    On Tue, Jul 23, 2013 at 10:54 PM, Ben Bolker <bbolker at gmail.com
    <mailto:bbolker at gmail.com>> wrote:

    > Tara Woud <t.y.woud at ...> writes:
    >

    > >
    > > Dear all,
    > >
    > > To determine the effect of weather parameters on the amount of

    core areas

    > > of mallards (71 different mallards with measurements on several

    days),

    > I'm

    > > trying to fit the following model to my data:
    > >
    > > model1 <- lmer(Core_areas  ~ c_MaxTemp + I(c_MaxTemp^2) +

    c_MinTemp + I(

    > > c_MinTemp^2) + c_GemTemp + I(c_GemTemp^2) + c_D.rain + c_S.rain +

    > c_Gemwind +

    > > c_Hwind + c_Lwind + (1 | Mallard)   # random slope | random

    factor (here

    > > individual is random factor), family = poisson)
    > >
    > > But then I get the following warning message:
    > >
    > > In mer_finalize(ans) : false convergence (8)
    > > What consequences does this have? And had anybody an idea how I

    can solve

    > > this??
    > >
    > > Best,
    > >
    > > Tara
    > >

    >
    >   [snip]
    >
    >   Are you willing to try out the development version of lme4
    > (which will, hopefully, be released and become the CRAN version
    > in about a week anyway)?  See the Installation section at
    > https://github.com/lme4/lme4/blob/master/README.md  ...
    >
    >   The new version tends to have fewer problems with false convergence
    > and more flexibility for exploring and fixing convergence problems
    > if they do occur.
    >
    >   Ben Bolker
    >
    > _______________________________________________
    > R-sig-mixed-models at r-project.org

    <mailto:R-sig-mixed-models at r-project.org> mailing list

    > https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
    >

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