SAS Note SN-000881

From: tsdlist@UNX.SAS.COM
Date: Thu Jul 08 1999 - 09:22:11 EDT


>>>>>>>> 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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