Use this field to specify initial values for
covariance
parameters or other options that are available in the PARMS statement for PROC MIXED or GLIMMIX.
The value list contains the initial values for the covariance parameters for any
random effects
specified and the residual
variance
, respectively. For example, if one random effect is specified, entering the text
(10) (2)
would set the initial value for the covariance parameter to 10 and for the residual variance to 2.
The
HOLD=
option can be used to hold parameter values to the initial values that are given. For example, entering
(10) (2) / hold=1,2
would hold both parameters to their initial values. Entering
(10) (2) / hold=2
would hold just the second (residual) variance component at the given value of 2.