SOLUTION | S
requests that a solution for the fixed-effects parameters be produced. Using notation
from the “Notation for the Generalized Linear Mixed Model” section beginning on
page 7, the fixed-effects parameter estimates areb , and their (approximate) estimated
standard errors are the square roots of the diagonal elements of cvar[b]. This matrix
commonly is of the form (X0bV−1X)− in GLMMs. You can output this approximate
variance matrix with the COVB option. See the section “Details” on page 108 section
on the construction of bV in the various models.
Along with the estimates and their approximate standard errors, a t statistic is
computed as the estimate divided by its standard error. The degrees of freedom
for this t statistic matches the one appearing in the “Tests of Fixed Effects” table
under the effect containing the parameter. If DDFM=KENWARDROGER or
DDFM=SATTERTH, the degrees of freedom are computed separately for each
fixed-effect estimate, unless you override the value for any specific effect with the
DDF=value-list option. The “Pr > |t|” column contains the two-tailed p-value corresponding
to the t statistic and associated degrees of freedom. You can use the CL
option to request confidence intervals for the fixed-effects parameters; they are constructed
around the estimate by using a radius of the standard error times a percentage
point from the t distribution.