Error when combining proportional residual error,
From: joannellyn.y.chiu@gsk.com
Subject: [NMusers] Error when combining proportional residual error,
Date: Wed, 2 Aug 2006 10:41:49 -0400
Hi,
My model had 4 proportional (eps 1,3,5,7) and 4 (eps 2,4,6,8) additive residual errors. I had
wanted to combine the proportional errors (eps 1,3 & eps 5,7) but wanted to leave the additive
residual errors individually. when i did this, I received an error that states:
0PROGRAM TERMINATED BY OBJ
ERROR IN CELS WITH INDIVIDUAL 934 ID=0.93400000E+03
WEIGHTED SUM OF "SQUARED" INDIVIDUAL RESIDUALS IS INFINITE
MESSAGE ISSUED FROM ESTIMATION STEP
AT INITIAL OBJ. FUNCTION EVALUATION
when i removed subject 934 and 935 from the dataset, it still came up with the same error. I've
even tried increasing the initial estimates. If anyone can help, it'll be much appreciated.
thank you,
Joannellyn
the code is:
IPRD=F
IF (STDY.EQ.1) THEN
Y=IPRD*EXP(EPS(1))+EPS(5)
ENDIF
IF (STDY.EQ.2) THEN
Y=IPRD*EXP(EPS(2))+EPS(6)
ENDIF
IF (STDY.EQ.3) THEN
Y=IPRD*EXP(EPS(3))+EPS(7)
ENDIF
IF (STDY.EQ.4) THEN
Y=IPRD*EXP(EPS(4))+EPS(8)
ENDIF
$SIGMA BLOCK(1) 1
$SIGMA BLOCK(1) SAME
$SIGMA BLOCK(1) 1
$SIGMA BLOCK(1) SAME
$SIGMA
20 ; EPS(5)
1000 ; EPS(6)
1000 ; EPS(7)
1000 ; EPS(8)