Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread rapton
Thank you all for your insight! I am glad to hear, at least, that I am doing something incorrectly (since the results do not make sense), and I am very grateful for your attempts to remedy my very limited (and admittedly self-taught) understanding of multilevel models and R. As I mentioned in th

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread Kingsford Jones
On Mon, Sep 7, 2009 at 10:34 AM, Alain Zuur wrote: > > > > rapton wrote: >> >> Hello, >> >> I am using R to analyze a large multilevel data set, using >> lmer() to model my data, and using anova() to compare the fit of various >> models.  When I run two models, the output of each model is generated

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread Alain Zuur
rapton wrote: > > Hello, > > I am using R to analyze a large multilevel data set, using > lmer() to model my data, and using anova() to compare the fit of various > models. When I run two models, the output of each model is generated > correctly as far as I can tell (e.g. summary(f1) and summ

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread Alain Zuur
rapton wrote: > > Hello, > > I am using R to analyze a large multilevel data set, using > lmer() to model my data, and using anova() to compare the fit of various > models. When I run two models, the output of each model is generated > correctly as far as I can tell (e.g. summary(f1) and summ

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread Gavin Simpson
erent fixed effects. " > >> > >> (from ?anova.lme in the nlme package). > >> > >> Are you using the REML = TRUE default? > >> > >> Bert Gunter > >> Genentech Nonclinical Statistics > >> > >> -Original Messa

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-07 Thread Viechtbauer Wolfgang (STAT)
: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1 > Hi Bert, > > Thank you for your note! I tried changing the REML default, and it > still produces the same result (see below). Is that what you meant > for me to try? > > Incidentally,

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-04 Thread Matt Killingsworth
help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On > Behalf Of rapton > Sent: Friday, September 04, 2009 9:10 AM > To: r-help@r-project.org > Subject: [R] Using anova(f1, f2) to compare lmer models yields seemingly > erroneous Chisq = 0, p = 1 > > > He

Re: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-04 Thread Bert Gunter
--Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of rapton Sent: Friday, September 04, 2009 9:10 AM To: r-help@r-project.org Subject: [R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1 Hello, I am using R

[R] Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1

2009-09-04 Thread rapton
Hello, I am using R to analyze a large multilevel data set, using lmer() to model my data, and using anova() to compare the fit of various models. When I run two models, the output of each model is generated correctly as far as I can tell (e.g. summary(f1) and summary(f2) for the multilevel mode