R help - Oct 2006 - lmer output

When I do lmer models I only get Estimate, Standard Error and t value in 
the output for the fixed effects.

Is there a way I get degrees of freedom and p values as well?

I'm a very new to R, so sorry if this a stupid question.

Thank you

- Mike

Mike Ford
Centre for Speech and Language
Department of Experimental Psychology
Downing Street
Cambridge
CB2 3EB

Tel: +44 (0) 1223 766559
Fax: +44 (0) 1223 766452

On Fri, 2006-10-06 at 17:05 +0100, Mike Ford wrote:
> When I do lmer models I only get Estimate, Standard Error and t value in 
> the output for the fixed effects.
> 
> Is there a way I get degrees of freedom and p values as well?
> 
> I'm a very new to R, so sorry if this a stupid question.
> 
> Thank you
> 
> - Mike
See R FAQ 7.35 Why are p-values not displayed when using lmer()?

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-are-p_002dvalues-not-displayed-when-using-lmer_0028_0029_003f

HTH,

Marc Schwartz

Thank you for the pointer to the FAQ. Thought I had searched the FAQ 
thoroughly, obviously I didn''t.

Unfortunately, my stats aren''t up to fully understanding the
explanation
and the proposed solution in the FAQ.
>For the time being, I would recommend using a Markov Chain Monte Carlo
>sample (function mcmcsamp) to evaluate the properties of individual
>coefficients (use HPDinterval or just summary from the "coda"
>package).  Evaluating entire terms is more difficult but you can
>always calculate the F ratio and put a lower bound on the denominator
>degrees of freedom.
Does anyone have the time to explain how I can do the above to get 
reportable degrees of freedom for the fixed effects for the analysis below.

Thank you.

- Mike

 > newtwods7.lmer
Formula: LnRT ~ 1 + DerF + bg + (1 | Subj) + (1 | Item)
    Data: newtwods2
     AIC    BIC logLik MLdeviance REMLdeviance
  -852.1 -824.4    431     -883.6         -862
Random effects:
  Groups   Name        Variance  Std.Dev.
  Item     (Intercept) 0.0036683 0.060567
  Subj     (Intercept) 0.0264120 0.162518
  Residual             0.0319315 0.178694
number of obs: 1880, groups: Item, 120; Subj, 37

Fixed effects:
              Estimate Std. Error t value
(Intercept)  6.328827   0.027611  229.21
DerF        -0.053572   0.007028   -7.62
bg           0.008921   0.007020    1.27

Correlation of Fixed Effects:
      (Intr) DerF
DerF -0.011
bg    0.001 -0.078

 > anova(newtwods2.lmer7)
Analysis of Variance Table
      Df  Sum Sq Mean Sq
DerF  1 1.81871 1.81871
bg    1 0.05157 0.05157

Mike Ford
Centre for Speech and Language
Department of Experimental Psychology
Downing Street
Cambridge
CB2 3EB

Tel: +44 (0) 1223 766559
Fax: +44 (0) 1223 766452

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