fixef.lmekin {coxme} | R Documentation |
Extraction functions for Lmekin
Description
Extract the fixed effects, random effects, variance of the fixed effects, or variance of the random effects from a linear mixed effects model fit with lmekin.
Usage
## S3 method for class 'lmekin'
fixef(object, ...)
## S3 method for class 'lmekin'
ranef(object, ...)
## S3 method for class 'lmekin'
vcov(object, ...)
## S3 method for class 'lmekin'
VarCorr(x, ...)
## S3 method for class 'lmekin'
logLik(object, ...)
Arguments
object |
an object inheriting from class |
x |
an object inheriting from class |
... |
some methods for this generic require additional arguments. None are used in this method. |
Details
For the random effects model , let
be the variance of the error term
.
Let
be the variance of the random effects
. There is a computational advantage to solving the problem
in terms of
instead of
, and that is what is
stored in the returned lmekin object.
The
VarCorr
function returns elements of ; the print
and summary functions report values of
.
Pinhiero and Bates call
the precision factor.
Value
the fixed effects are a vector and vcov returns their variance/covariance matrix. The random effects are a list with one element for each random effect. The ranef component contains the coefficients and VarCorr the estimated variance/covariance matrix. The logLik method returns the loglikelihood along with its degrees of freedom.
Author(s)
Terry Therneau
References
J Pinheiro and D Bates, Mixed-effects models in S and S-Plus. Springer, 2000.
See Also
lmekin
, random.effects
,
fixed.effects
, link{vcov}
, VarCorr
Examples
data(ergoStool, package="nlme") # use a data set from nlme
efit <- lmekin(effort ~ Type + (1|Subject), ergoStool)
ranef(efit)