Parameters of a mixed linear model. Can be either a
MixedLMParams instance, or a vector containing the packed
model parameters in which the fixed effects parameters are
at the beginning of the vector, or a vector containing
only the fixed effects parameters.
exog : array-like, optional
Design / exogenous data for the fixed effects. Model exog
is used if None.
Returns:
An array of fitted values. Note that these predicted values :
only reflect the fixed effects mean structure of the model. :