[R-sig-eco] convergence problems for zero-inflated model

[Highland Statistics Ltd]

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Message: 5
Date: Mon, 23 Sep 2013 15:29:54 +0000
From: "Lee, Laura" <laura.lee at ncdenr.gov>
To: "r-sig-ecology at r-project.org" <r-sig-ecology at r-project.org>
Subject: [R-sig-eco] convergence problems for zero-inflated model
Message-ID:
	<2789D349964A854E9524A3CD0D759E042DBF0EBA at NCWWDITMXMBX35.ad.ncmail>
Content-Type: text/plain

Hi all!

I'm using a zero-inflated model using the function 'zeroinfl' and running into convergence
problems (system is computationally singular). How can I modify the code so it does not calculate a Hessian matrix?



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Hi....I think it is more important that you figure out why you have numerical trouble. Most likely
your model is too complicated.....or you have included an interaction term for which there is no data...or something like that.

Alain Zuur

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Thanks,

Laura