Likelihood
From: LSheiner
Subject: [NMusers] Likelihood
Date: Tue, 02 Apr 2002 13:44:22 -0800
FYI ...
Quoted reply history
-------- Original Message --------
Date: Tue, 2 Apr 2002 09:26:32 -0800 (PST)
From: "S.Beal"
To: lewis
Assuming that there is a covariate being tested that allows Y to be set
as above for a PK observation and differently for a PD observation,
in principle the above should work. There could be any number of
reasons peculiar to the user's set-up that accounts for the error message.
It is possible that the argument of EXP is becoming very negative, and
due to the heavy-truncation of the EXP function, the likelihood has
become 0. It might be better to use the option -2LL, rather than LIKE
(and code the above accordingly).
Stu