[NMusers] if-the-statement for 3 class categorical covariate

[Bernard Ngara]

Dear all

I am shoked because NONMEM sents a crash message when i factor in
covariate modeling using a 4 class categorical variable genotype:
IF (GENE.EQ.3) THEN           ;GG
        CL = THETA(1)* EXP(ETA(1))
    ELSE IF (GENE.EQ.2)THEN       ;GT
        CL = THETA(6)* EXP(ETA(3))
    IF (GENE.EQ.1) THEN           ;TT
        CL = THETA(7)* EXP(ETA(4))
    IF (GENE.EQ.4) THEN           ;MISSING
        CL = THETA(7)* EXP(ETA(4))
    END IF
However if i binarize the code, nonmem runs successfully
IF (GENE.EQ.3) THEN
        CL = THETA(1)* EXP(ETA(1))
    ELSE
        CL = THETA(6)* EXP(ETA(3))

    END IF

Thanks in advance
-- 
Bernard Ngara
Trainee Biostatistician
Africa Institute of Biomedical Science and Technology
P. O Box 2294
Harare
Zimbabwe
+263 772 160 896