SAS Note V6-LOGISTIC-G043

From: tsdlist@UNX.SAS.COM
Date: Thu Jul 08 1999 - 09:24:54 EDT


>>>>>>>> SAS Notes -- Copyright (c) 1991 - 1999 by SAS Institute Inc. <<<<<<<<

V6-LOGISTIC-G043 *** ALERT NOTE *** PRODUCT: STAT
                                                        PROCEDURE: LOGISTIC
TITLE: Parameter not set to zero as indicated by NOTE, but DF=0

KEYS: INEST= LINEAR COMBINATION DEPENDENCY PARAMETERS SET TO ZERO NONZERO
       INCORROUT CTABLE PREDICT= XBETA= OUTPUT

    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 6.11 TS020
HP800 6.11 TS020
IABI 6.11 TS040
MIPS ABI 6.11 TS040
OSF/AXP 6.11 TS040
OS/2 6.11 TS020
Solaris 6.11 TS020
Windows 6.11 TS020
WIN/NT 6.11 TS040
Win95 6.11 TS040
AIX/R 6.12 TS020
DigitUnx 6.12 TS040
HP800 6.12 TS020
Macintosh 6.12 TS040
OS/2 6.12 TS020
Solaris 6.12 TS020
VMS/AXP 6.12 TS020
Windows 6.12 TS020
WIN/NT 6.12 TS020
Win95 6.12 TS020



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