This function calculates the estimated variances, standard
deviations, and correlations between the random-effects terms in a
linear mixed-effects model, of class "lme", or a nonlinear
mixed-effects model, of class "nlme". The within-group error
variance and standard deviation are also calculated.
VarCorr(x, sigma = 1, ...)
# S3 method for lme
VarCorr(x, sigma = x$sigma, rdig = 3, ...)# S3 method for pdMat
VarCorr(x, sigma = 1, rdig = 3, ...)
# S3 method for pdBlocked
VarCorr(x, sigma = 1, rdig = 3, ...)
a matrix with the estimated variances, standard deviations, and correlations for the random effects. The first two columns, named
Variance and StdDev, give, respectively, the variance
and the standard deviations. If there are correlation components in
the random effects model, the third column, named Corr,
and the remaining unnamed columns give the estimated correlations
among random effects within the same level of grouping. The
within-group error variance and standard deviation are included as
the last row in the matrix.
a fitted model object, usually an object inheriting from
class "lme".
an optional numeric value used as a multiplier for the
standard deviations. The default is x$sigma or 1
depending on class(x).
an optional integer value specifying the number of digits
used to represent correlation estimates. Default is 3.
further optional arguments passed to other methods (none for the methods documented here).
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Pinheiro, J.C., and Bates, D.M. (2000) Mixed-Effects Models in S and S-PLUS, Springer, esp. pp. 100, 461.
lme, nlme
fm1 <- lme(distance ~ age, data = Orthodont, random = ~age)
VarCorr(fm1)
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