[ADMB Users] When to use mfexp

[Mark Maunder]

Are there any guidelines in using mfexp

The following two bits of code give different results in a negative binomial model

                              like=-log((1.0-pzi)*mfexp(log_negbinomial_density(Obs(i,8),ypred,tau)));
                              like=-log((1.0-pzi)*exp(log_negbinomial_density(Obs(i,8),ypred,tau)));

Is there any benefit from replacing

mfexp(log_negbinomial_density(Obs(i,8),ypred,tau))

with

negbinomial_density(Obs(i,8),ypred,tau)

Thanks,

Mark Maunder

IATTC fall workshop: Using Oceanography for Fisheries Stock Assessment and Management
11-14 October 2011, La Jolla, CA
http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Using+Oceanography+for+Fisheries+Stock+Assessment+and+Management+2011




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Inter-American  Tropical Tuna Commission

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ADMB Foundation

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mmaunder at iattc.org<mailto:mmaunder at iattc.org>
http://www.fisheriesstockassessment.com/TikiWiki/tiki-index.php?page=Mark+Maunder

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