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| From: | Eric Hack |
| Subject: | translating a model into MCSim |
| Date: | Tue, 20 Jul 2004 14:37:42 -0400 |
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Dear Frederic, I want to translate a model to MCSim and have a couple of
questions. The model is a discrete-time model and the data are time (duration)
of exposure, outcome (tumor or no), and frequency at many time points and
exposure levels. The model incorporates an ad hoc likelihood function
which was being used to obtain MLEs for the parameters. Can a user-defined likelihood function be easily implemented
in MCSim? There are also several logical constructs that I think may be
difficult to translate to MCSim. The code includes many if-then-else blocks,
do loops, goto statements, and scheduled code blocks (to run at specific value
of independent variable). I think all of the do loops and goto statements
facilitate array operations, so I should be able to use vector indexing,
right? Can the if-then-else blocks be coded in the model definition file,
or should I code these into the model.c file after the translation by mod? Thank you, Eric C.
Eric Hack Toxicology
Excellence for Risk Assessment (TERA) Cincinnati,
OH 45211 (513)
542 7475 x 19 |
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