RE: Error when combining proportional residual error,

From: Leonid Gibiansky leonidg@metrumrg.com Subject: RE: [NMusers] Error when combining proportional residual error, Date: Wed, 02 Aug 2006 13:22:29 -0400 No, this is not the case with NONMEM. It is perfectly OK to combine exponential and additive errors. My guess is that STDY is not equal to 1, 2, 3, or 4 for some observation, or there exist some other model coding error that is difficult to find without seeing the entire code. To avoid STDY problem, try Y=IPRD*EXP(EPS(1))+EPS(5) 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 Leonid