SAS Note V7-NLIN-0486

From: tsdlist@UNX.SAS.COM
Date: Wed Mar 24 1999 - 10:09:55 EST


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

V7-NLIN-0486 *** ALERT NOTE *** PRODUCT: STAT
                                                        PROCEDURE: NLIN
TITLE: Incorrect standard errors possible when BOUNDS are active

KEYS: INCORRECT STANDARD ERRORS BOUNDS ACTIVE INCORROUT INCORRSTAT

    If a parameter is stuck at a bound, the standard error of the parameters
    may be incorrect. This problem will occur if there is only one
    parameter in the model (and it is stuck at a bound) or if the parameter
    that is stuck at the bound is any parameter except the last one listed
    in the table of parameter estimates.

    To circumvent this problem, reorder the parameters so that the one that
    is stuck at its bound is the last one listed in the table of parameter
    estimates (assuming that there is more than one parameter in the model).

+------REPORTED------+ +---FIXED---+
SYSTEM RELEASE LEVEL RELEASE LEVEL

AIX/R 7.00 0P1 .
CMS 7.00 0P1 .
DigitUnx 7.00 0P1 .
HP800 7.00 0P1 .
MVS 7.00 0P1 .
OS/2 7.00 0P1 .
Solaris 7.00 0P1 .
VMS/AXP 7.00 0P1 .
VMS 7.00 0P1 .
WIN/NT 7.00 0P1 .
Win98 7.00 0P1 .
Win95 7.00 0P1 .



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