Re: Minimization terminated ?
Dear Navin,
Regarding your second question you might want to look at a poster abstract in
PAGE 2006 by Nick Holford et al.
http://www.page-meeting.org/default.asp?abstract=992
Regards
Nitin
navin goyal <[EMAIL PROTECTED]> wrote:
Dear NM Users,
I am using trying to model some POPPK data in NONMEM vi
Sometimes I get the following message in the output file
MINIMIZATION TERMINATED
DUE TO ROUNDING ERRORS (ERROR=134)
NO. OF FUNCTION EVALUATIONS USED: 1103
NO. OF SIG. DIGITS UNREPORTABLE
But when I change the SIGDIGITS to a lower value the minimization is
successful. What exactly is happening in this case ? Is there something I am
missing out?
what about the parameter estimates obtained in such a run ?
Another question related to this is that when I bootstrap a model in wings for
nonmem WFN, I get few runs with similar message where in it also says the same
message as above ..MINIMIZATION TERMINATED DUE TO ROUNDING ERRORS (ERROR=134)
NO. OF SIG. DIGITS UNREPORTABLE.
This means that I discard these runs from the calculations ?
I have attached the control stream below :
$SUBROUTINE ADVAN6 TRANS1 TOL=3
$MODEL
COMP=(DEPOT,DEFDOSE);
COMP=(CENTRAL);PLASMA
COMP=(PERIPH);PERIPHERAL
$PK
TVF1=THETA(1)
F1=TVF1*EXP(ETA(1))
TVCL=THETA(2)
CL=TVCL*EXP(ETA(2))
TVVC=THETA(3);vol of dist of drug
VC=TVVC*EXP(ETA(3))
TVK20=THETA(4)
K20=TVK20*EXP(ETA(4))
K12=THETA(5)*EXP(ETA(5));Abso constant
K23=THETA(6)*EXP(ETA(6))
K32=THETA(7)*EXP(ETA(7))
CL=K20*VC
SC=VC; OUTPUT IN ng/ml
$ERROR
IPRED=F
IRES=DV-IPRED
DEL=0
IF (IPRED.EQ.0) DEL=1
IWRE=(1-DEL)*IRES/(IPRED+DEL)
Y=F+F*ERR(1);+ERR(2)
$DES
DADT(1)=-K12*A(1)
DADT(2)=K12*A(1)-K20*A(2)-K23*A(2)+K32*A(3)
DADT(3)=K23*A(2)-K32*A(3)
$THETA
(0.1,0.3,0.7);
(75 FIXED);CL
(0,550,1000);VC
(0.02,0.2,2);K20
(7 FIXED);K12
(0.01 ,0.1,10);K23
(0.01,0.1,10);K32
$OMEGA
(0.01);INH
(0.001);CL
(0.01);VC
(0.01);K20
(0.01);K12
(0.01);K23
(0.01);K32
$SIGMA
(0.04);
$ESTIMATION METHOD=1 SIGDIGITS=2 MAXEVAL=9999 PRINT=10 POSTHOC
$COV MATRIX=S
$TABLE ID TIME EVID CMT IPRED IWRE IRES CL VC K20 F1
NOPRINT ONEHEADER FILE=sdtabdoc5
--
--Navin
Nitin Mehrotra, Ph.D
Post Doctoral Research Fellow
874 Union Avenue, Suite4.5p/5p
Department of Pharmaceutical Sciences
University of Tennessee Health Science Center
Memphis, TN, USA-38163
901-448-3385 (Lab)
[EMAIL PROTECTED]
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