This class of object is returned by the lmekin function to
represent a fittd mixed effect linear model.
Objects of this class currently have methods for print and
residuals.
A list with the folling components:
a list with components fixed and
random; the first will be NULL for a model with no fixed
effects. The random component is itself a list, with an
element for each random effect.
the variance matrix of the fixed effects
the parameters of the variance matrix of the random effects.
vector of residuals from the fit
either "ML" or "REML"
the log-likelihood for the fitted model
the estimated residual error
number of observations used
a copy of the call
this will be present if any observations were removed due to missing values