Message-ID: <20140212181411.Horde.0Xcna-rBk2lS-ABDwBYD3FA@webmail.hampshire.edu>
Date: 2014-02-12T23:14:11Z
From: juwb08 at hampshire.edu
Subject: new version of lme4 - Log-Likelihood of model returned as "-Inf"
In-Reply-To: <20140212181035.Horde.DeXeC-rBk2lS_-9rZPNzybA@webmail.hampshire.edu>
... the dataset failed to attach, so here it is.
Sorry!
Quoting juwb08 at hampshire.edu:
> Hi All,
>
> I was working with Poisson glmms in lme4 last year in 2013 using
> Windows XP, lme4 version 0.999375-16 (2008-06-23) and R version
> 2.15.1 (2012-06-22), evaluating a set of candidate models with AIC
> to select the best ones.
>
> This worked well until I updated lme4 and R last month.
>
> I now updated to R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
> and lme4 version 1.0-5 (2013-10-24), still Windows XP, and am
> running the same models again on the same data, and lme4 now returns
> "-Inf" for the log likelihood, so it can't calculate AIC.
>
> Using the previous versions, I got stable values for Log-Likelihoods
> and calculated AICs with them.
>
> Attached is a sample of the dataset and the code I am using.
>
> How can I get a Log-Likelihood estimate with the current versions of
> lme4 and R?
>
> Thanks in advance.
> Justin Baldwin
>
> Hampshire College, MA, USA