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I’m trying to specify the joint distribution of 3 parameters in JAGS using a truncated multivariate normal (one of the 3 parameters is truncated at zero, the others are untruncated).

I’ve successfully implemented the 1 parameter case using:

a ~ dnorm(mu,prec)T(0, )

And a bivariate case using the trick discussed here: https://sourceforge.net/p/mcmc-jags/discussion/610037/thread/9472caff/

But I am stuck on the extension to 3 parameters. Any suggestions would be greatly appreciated!

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