[R] extracting correlations from nlme

From: Evelyn Hall <evelynw_at_camden.usyd.edu.au>
Date: Mon 11 Apr 2005 - 14:56:01 EST


Hi,

I would like to know how (if) I can extract some of the information from the summary of my nlme.
at present, I get a summary looking something like this:

> summary(fit.nlme)

Nonlinear mixed-effects model fit by maximum likelihood

   Model: MLKYLD ~ W4(DIM, logA, B, C)
  Data: ADHIS.x0

     AIC BIC logLik
   265314 265401.6 -132647

Random effects:
  Formula: list(logA ~ 1 , B ~ 1 , C ~ 1 )   Level: ID
  Structure: General positive-definite

             StdDev Corr

    logA 0.480476962 logA   B
       B 0.140839992 -0.855
       C 0.001706867 -0.523  0.819
Residual 3.164491614


Fixed effects: logA + B + C ~ 1
        Value  Std.Error    DF  t-value p-value
logA 3.005178 0.01025308 41835 293.1000  <.0001

   B 0.091446 0.00296687 41835 30.8223 <.0001    C 0.002727 0.00003245 41835 84.0336 <.0001

Standardized Within-Group Residuals:

       Min Q1 Med Q3 Max   -5.107463 -0.5581999 -0.01962435 0.5032916 31.28465

Number of Observations: 46831
Number of Groups: 4994

I would like to extract the table of correlations, but have not been able to do it.

Any assistance, much appreciated.

Cheers,
Evelyn

Evelyn Hall
PhD Student
Faculty of Veterinary Science
The University of Sydney
PMB 3 Camden, NSW, 2570
Phone: +61 2 9036 7736
Email: evelynw@camden.usyd.edu.au

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