I run a linear mixed-effects model in a loop
for (i in 1:N) {
fit.lme <- lme(Y ~ X1*X2, random = ~1|subj, Model[i]);
}
As the data in some iterations are all (or most) 0's, leading to the
following error message from lme:
Error in chol((value + t(value))/2) : the leading minor of order 1 is
not positive definite
First the above error message stops the looping and does not allow me
to continue the computation. So what is a good way to catch the error
without spilling on the screen so that I can keep the looping and at
the meantime stuff the corresponding output with some artificial
value such as 0?
Thanks,
Gang
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