On Tue, 13 Aug 2013, Cade, Brian wrote:
Lauria: For historical reasons the logistic regression (binomial with
logit link) model portion of a zero-inflated count model is usually
structured to predict the probability of the 0 counts rather than the
nonzero (=1) counts so the coefficients will
Z is correct, of course. I was just being a little too simplistic in my
explanation trying to emphasize the reversal of signs of the coefficients
in the logistic regression part of the zero-inflated model.
Brian
Brian S. Cade, PhD
U. S. Geological Survey
Fort Collins Science Center
2150 Centre
://www.nephrops.eu
From: Cade, Brian [ca...@usgs.gov]
Sent: 14 August 2013 16:15
To: Achim Zeileis
Cc: Lauria, Valentina; r-help@R-project.org
Subject: Re: [R] Problem with zero-inflated negative binomial model in sediment
river dynamics
Z is correct, of course. I
On Wed, 14 Aug 2013, Cade, Brian wrote:
Z is correct, of course. I was just being a little too simplistic in my
explanation trying to emphasize the reversal of signs of the
coefficients in the logistic regression part of the zero-inflated model.
When users ask me what the binary part of the
Dear All,
I am running a negative binomial model in R using the package pscl in oder to
estimate bed sediment movements versus river discharge. Currently we have
deployed 4 different plates to test if a combination of more than one plate
would better describe the sediment movements when the
Lauria: For historical reasons the logistic regression (binomial with
logit link) model portion of a zero-inflated count model is usually
structured to predict the probability of the 0 counts rather than the
nonzero (=1) counts so the coefficients will be the negative of what you
expect based on
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