>>>>>>>> SAS Notes -- Copyright (c) 1991 - 1999 by SAS Institute Inc. <<<<<<<<
SN-000881 *** ALERT NOTE *** PRODUCT: STAT
TITLE: Parameter not set to zero as indicated by NOTE, but DF=0
KEYS: LINEAR DEPENDENCY PARAMETERS SET TO ZERO NONZERO INCORROUT PREDICT=
XBETA= OUTPUT INEST= CTABLE COMBINATION
If initial parameter values are input using the INEST= option and there
is a linear dependency among the columns of the design matrix, PROC
LOGISTIC will issue a NOTE in the output indicating that the linear
dependency exists and that parameters are set to zero as a result.
However, the parameter estimates table may show nonzero values for these
parameters even though their degrees of freedom are zero. Also, X*Beta
and predicted values from the XBETA= and PREDICT= options on the OUTPUT
statement are incorrect as is the output of the CTABLE option which
relies on predicted values. To avoid the problem, remove the linear
dependencies indicated by the NOTE.
+------REPORTED------+ +---FIXED---+
SYSTEM RELEASE LEVEL RELEASE LEVEL
AIX/R 7.00 0B1 .
CMS 7.00 0B1 .
DigitUnx 7.00 0B1 .
HP800 7.00 0B1 .
MVS 7.00 0B1 .
OS/2 7.00 0B1 .
Solaris 7.00 0B1 .
VMS/AXP 7.00 0B1 .
VMS 7.00 0B1 .
WIN/NT 7.00 0B1 .
Win95 7.00 0B1 .
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