Outputs for direct and indirect contact

Posted September 22, 2009 by guest
NAADSM 3.1
Disease spread by contact
Interpreting NAADSM output
I have a question which revolves around the output information provided by NAADSM. It provides the mean number of animals exposed to the disease via direct contact and the mean number of animals exposed to the disease via indirect contact. Can you add those two means together and get the mean number of animals exposed to the disease through contact? Or is the mean number of animals exposed to the disease via indirect contact an aggregate measure of all exposures (i.e. direct and indirect contact)? Thank you for your help. I really do appreciate it.
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Re: Outputs for direct and indirect contact

Posted September 22, 2009 by Aaron Reeves
> It provides the mean number of animals
> exposed to the disease via direct contact
> and the mean number of animals exposed
> to the disease via indirect contact. Can
> you add those two means together and get
> the mean number of animals exposed to the
> disease through contact?
 Yes, adding these two numbers together would work, if you're interested in the mean. If you are interested in the median number of animals in herds exposed by any kind of contact, or if you wanted to see the overall distribution of that number generated by the model (the median, some other percentile, or the complete distribution are often used to report modeling results like this), it would take a little more work. All of the data that you would need, though, is stored in the scenario database file. > Or is the mean number of animals exposed
> to the disease via indirect contact an aggregate
> measure of all exposures (i.e. direct and indirect
> contact)?
 Indirect contact really is just indirect contact. The mean numbers of animals in herds exposed by direct and by indirect contact are reported separately, so the approach described above is the right one.