SAS/STAT 922 User's Guide: The MIXED Procedure (Book Excerpt)

4532 ✦ Chapter 56: The MIXED Procedure
MMEQ
(see Chapter 39, “The GLM Procedure,” for further explanation). The resulting method-ofmoment
variance component estimates are used in subsequent calculations, including standard
errors computed from ESTIMATE and LSMEANS statements. For ODS purposes, the new
table names are “Type1,” “Type2,” and “Type3,” respectively.
requests that coefficients of the mixed model equations be displayed. These are
"
X 0bR 1X X 0bR 1Z Z 0bR 1X Z 0bR 1Z C bG 1
# "
X
;
0bR 1y Z 0bR 1 #
y
assuming that bG is nonsingular. If bG is singular, PROC MIXED produces the following
coefficients:
"
X 0bR 1 X X 0bR 1 ZbG
bGZ 0bR 1 X bGZ 0bR 1 ZbG C bG
#
;
"
X 0bR 1 y
bGZ 0bR 1 y
See the section “Estimating Fixed and Random Effects in the Mixed Model” on page 4601 for
further information about these equations.
MMEQSOL
requests that a solution to the mixed model equations be produced, as well as the inverted
coefficients matrix. Formulas for these equations are provided in the preceding description of
the MMEQ option.
When bG is singular, b and a generalized inverse of the left-hand-side coefficient matrix are
transformed by using bG to produce b and bC, respectively, where bC is a generalized inverse of
the left-hand-side coefficient matrix of the original equations.
NAMELEN< =number >
specifies the length to which long effect names are shortened. The default and minimum value
is 20.
NOBOUND
has the same effect as the NOBOUND option in the PARMS statement.
NOCLPRINT< =number >
suppresses the display of the “Class Level Information” table if you do not specify number. If
you do specify number, only levels with totals that are less than number are listed in the table.
NOINFO
suppresses the display of the “Model Information,” “Dimensions,” and “Number of Observations”
tables.
NOITPRINT
suppresses the display of the “Iteration History” table.
NOPROFILE
includes the residual variance as part of the Newton-Raphson iterations. This option applies
only to models that have a residual variance parameter. By default, this parameter is profiled
out of the likelihood calculations, except when you have specified the HOLD= option in the
PARMS statement.
#