Message-ID: <CA+Q3t4GtUJMD+wwHspu86f+0tmqhPBR=PrqmO=aq08p2+97ZfA@mail.gmail.com>
Date: 2018-04-11T20:26:47Z
From: Nat Holland
Subject: alternative suggestions to glmmTMB family=beta
I have tried to use the following model to fit beta distribution response
variable, with high frequency of data at upper end of 0 to 1.0 range of
histogram.
glmmTMB(vas2 ~ bmt + (bmt|studyid), family=list(family="beta",link="logit"))
I get the following warning messages:
Warning messages:
1: In fitTMB(TMBStruc) :
Model convergence problem; non-positive-definite Hessian matrix. See
vignette('troubleshooting')
2: In fitTMB(TMBStruc) :
Model convergence problem; false convergence (8). See
vignette('troubleshooting')
Reading about this on the troubleshooting pages suggests "Models with
non-positive definite Hessian matricies should be excluded from further
consideration, in general."
Any suggestions on alternative means of analyses to evaluate the above
model?
Thanks in advance,
Nat
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J. Nathaniel Holland, Ph.D.
e-mail: jnhollandiii at gmail.com
LinkedIn: https://www.linkedin.com/in/jnhollandiii/
Google Scholar:
https://scholar.google.com/citations?user=VbHqPXEAAAAJ&hl=en
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