[SOLVED] Gibbs Sampler Error

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[SOLVED] Gibbs Sampler Error

Postby niafall » Fri Nov 04, 2016 8:00 pm

I am using the gibbs sampler (gibbs) to generate a normal distribution from an anamorphosis transformed, truncated distribution. In most cases (I am running this for many fish surveys) it works perfectly, but in one case I get the following error:

Code: Select all
Error in the matrix inversion : Pivot #2 is null
Error during the covariance matrix inversion

The function is interrupted
Error: Error in R_gibbs


Can anyone help with this?
niafall
 
Posts: 12
Joined: Tue May 17, 2016 5:46 pm

Re: Gibbs Sampler Error

Postby Didier Renard » Fri Nov 04, 2016 11:24 pm

The only possible reason for such a behavior is the presence of duplicate which make the covariance matrix singular.
Please use db.duplicate to check.
Didier Renard
 
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Re: Gibbs Sampler Error

Postby niafall » Sat Nov 05, 2016 1:35 am

Thanks, Didier!

I did indeed find a duplicate record; it's working now.
niafall
 
Posts: 12
Joined: Tue May 17, 2016 5:46 pm


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