[R] lme output
John Logsdon
j.logsdon at quantex-research.com
Mon Jan 16 18:07:43 CET 2006
I am trying to extract the solution from a simple lme calculation.
For example (the first 4 have a mean 0, sd 1):
> y<-c(-1.118,-.5,.5,1.118,10)
> gp<-factor(c(rep('one',4),'two'))
> res<-lme(y~1,rand=~1|gp)
Linear mixed-effects model fit by REML
Data: NULL
Log-restricted-likelihood: -8.67141
Fixed: y ~ 1
(Intercept)
4.962502
Random effects:
Formula: ~1 | gp
(Intercept) Residual
StdDev: 7.026737 0.9999747
Number of Observations: 5
Number of Groups: 2
The problem is to get the random effects intercept - essentially the
between groups standard deviation - into a scalar. I can't see anything
in the values from res. The other values - fixed intercept and residual -
are clearly available - eg res$coeff$fixed is straight forward.
I would use lmer but this does not appear to return any values.
Can someone advise please? I do recall having this problem some time ago
but that was with a much older version. This is with R 2.2.1 and the
latest lme.
TIA
Best wishes
John
John Logsdon "Try to make things as simple
Quantex Research Ltd, Manchester UK as possible but not simpler"
j.logsdon at quantex-research.com a.einstein at relativity.org
+44(0)161 445 4951/G:+44(0)7717758675 www.quantex-research.com
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