4.15 Covariance components to be treated as fixed

WOMBAT provides limited facilities to fix certain covariance components at their input values, while maximising the (log) likelihood with respect to the remaining parameters. Again, this information is given in a block entry. The block begins with a line containing the code FIXVAR (no abbreviation) and, as usual, ends with a line containing the code END. Each line within the block is then expected to have the following entries:

(a)
The name of the random effect, as specified in the MODEL block.
(b)
The code ALL to signify that all pertaining covariances are fixed.

In the moment, no options to fix individual elements of covariance matrices are recognised.