ROUNDING ERRORS (ERROR=134)

From: Jerry Zhao Date: May 13, 2003 technical Source: cognigencorp.com
From: "Jerry Zhao" Subject: [NMusers] ROUNDING ERRORS (ERROR=134) Date:Tue, 13 May 2003 10:56:55 -0800 Dear All, I am trying to simultaneously model parent and metabolite (control file attached to the end of the message). I used log transformed data. But I kept getting Rounding Error message: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 0MINIMIZATION TERMINATED DUE TO ROUNDING ERRORS (ERROR=134) NO. OF FUNCTION EVALUATIONS USED: 958 NO. OF SIG. DIGITS UNREPORTABLE ETABAR IS THE ARITHMETIC MEAN OF THE ETA-ESTIMATES, AND THE P-VALUE IS GIVEN FOR THE NULL HYPOTHESIS THAT THE TRUE MEAN IS 0. ETABAR: 0.13E-01 -0.62E-02 0.66E-02 -0.39E-02 0.49E-01 0.44E-01 P VAL.: 0.86E+00 0.93E+00 0.94E+00 0.96E+00 0.74E+00 0.67E+00 1 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Could someone please shed some light on what is causing this error and what I should do to get rid of it? The model fit at the point of termination looks quite good, and the parameter estimates are quite good too. Thank you. Jeri Sottos ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ $PROBLEM 2Comp Parent Drug 1Comp Metabolite Model -- Log Transformed DV $DATA DATA_LOG.PRN $INPUT ID AMT RATE TIME DV CMT EVID $SUBROUTINES ADVAN6 TRANS1 TOL=5 $MODEL NPAR=6 NCOMP=3 COMP=(PARCEN DEFDOSE DEFOBS) ;CENTRAL COMPARTMENT FOR PARENT DRUG COMP=(PARPER NODOSE) ;PERIPHERAL COMPARTMENT FOR PARENT DRUG COMP=(METCEN NODOSE) ;CENTRAL COMPARTMENT FOR METABOLITE $PK CLt=THETA(1)*EXP(ETA(1)) ;PARENT DRUG CENTRAL CLEARANCE Vc=THETA(2)*EXP(ETA(2)) ;PARENT DRUG CENTRAL COMPARTMENT VOLUME CLd=THETA(3)*EXP(ETA(3)) ;PARENT DRUG DISTRIBUTION CLEARANCE Vp=THETA(4)*EXP(ETA(4)) ;PARENT DRUG PERIPHERAL COMPARTMENT VOLUME CLtm=THETA(5)*EXP(ETA(5)) ;METABOLITE CENTRAL CLEARANCE Vcm=THETA(6)*EXP(ETA(6)) ;METABOLITE CENTRAL COMPARTMENT VOLUME S1=Vc/1000 S3=Vcm/1000 $DES DADT(1)=-(CLt+CLd)/Vc*A(1)+CLd/Vp*A(2) DADT(2)=CLd/Vc*A(1)-CLd/Vp*A(2) DADT(3)=-CLtm/Vcm*A(3)+.4045*CLt/Vc*A(1) ;40.45% OF PARENT DRUG IS COVERTED INTO METABOLITE $ERROR FLAG=0 IF(AMT.NE.0)FLAG=1 ;dosing records only IPRED=LOG(F+FLAG) ;transform the prediction to the log of the ;prediction ; IPRED=log(f) for concentration records and ; IPRED=log(f+1) for dose records R1=0 IF (CMT.EQ.1) R1=1 R2=0 IF (CMT.EQ.3) R2=1 Y1=IPRED+EPS(1) Y3=IPRED+EPS(2) Y=R1*Y1+R2*Y3 YORI=EXP(Y) ; y in normal scale DVORI=EXP(DV) ; DV in normal scale IRES=EXP(DV)-EXP(IPRED) $THETA (10,33) (10,27) (30,60) (30,86) (10,17) (10,36) $OMEGA BLOCK(6) .24 .01 .28 .27 .01 .36 .20 .16 .25 .32 .24 .05 .24 .10 0.77 .17 .03 .09 .02 0.43 0.47 $SIGMA BLOCK (2) .06 .09 .18 $ESTIMATION METHOD=1 INTERACTION PRINT=10 POSTHOC REPEAT MAXEVAL=9999 $TABLE ID TIME CMT IPRED IRES CLt Vc CLd Vp CLtm Vcm NOPRINT FILE=mTBL.TXT $COV $SCAT DVORI VS TIME BY CMT $SCAT YORI VS TIME BY CMT $SCAT IRES VS TIME BY CMT ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
May 13, 2003 Jerry Zhao ROUNDING ERRORS (ERROR=134)
May 13, 2003 Atul Bhattaram Venkatesh RE: ROUNDING ERRORS (ERROR=134)
May 13, 2003 Jerry Zhao Re: RE: ROUNDING ERRORS (ERROR=134)
May 14, 2003 Leonid Gibiansky Re: RE: ROUNDING ERRORS (ERROR=134)