problem with NLMIXED Execution error for observation 1

[alfa95]

Hello everybody,

I am doing non linear mixed model. 

my code is as follow:

proc nlmixed data=dataq1prev2 qpoints=4;
parms  eta=2.02 etadiff=-0.32 tau=6.24
taudiff=0.9 gamma=-0.002 gdiff=0 sigma2=0.0007 
d11=0.0022 d22=0.0009 d33=0.14;
num = ((eta + etadiff * group + n));
den = ((tau + t+ taudiff * group );
mean = num/den + gamma + gdiff * group ;
model reponse~ normal(mean,sigma2);
random t n ~ normal([0, 0],[d11,0,d22])
subject=vog out=eb;
run;

I get error saying "NOTE: Execution error for observation 1."

 

I will very appreciate any help, thank you

[PaigeMiller]

Please describe the problem.

[alfa95]

@PaigeMiller I edited the post, thank you

[PaigeMiller · Accepted solution]

So step #1

You look at the data yourself, and make sure there are no missing values in observation 1, and that all mathematical operations that you are trying to do on this data are defined (for example, if you have a negative number you can't raise it to a non-integer power).

[alfa95]

@PaigeMiller 

thank you