quot;r-help@r-project.org" , Bert Gunter
Subject: Re: [R] fit a "threshold" function with nls
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Content-Type: text/plain
Thank you all for your help. I think I now understand the issue.
I tried to write a likelihood function for my binomial model.
Please excuse m
__
>> From: Vito Muggeo [vito.mug...@unipa.it]
>> Sent: Tuesday, October 16, 2012 9:55 AM
>> To: Bert Gunter
>> Cc: Véronique Boucher Lalonde; r-help@r-project.org; Ravi Varadhan
>> Subject: Re: [R] fit a "threshold" function with nls
>>
>>
using
> optimization tools.
>
> Best,
> Ravi
>
> From: Vito Muggeo [vito.mug...@unipa.it]
> Sent: Tuesday, October 16, 2012 9:55 AM
> To: Bert Gunter
> Cc: Véronique Boucher Lalonde; r-help@r-project.org; Ravi Varadhan
> Subjec
Ravi
From: Vito Muggeo [vito.mug...@unipa.it]
Sent: Tuesday, October 16, 2012 9:55 AM
To: Bert Gunter
Cc: Véronique Boucher Lalonde; r-help@r-project.org; Ravi Varadhan
Subject: Re: [R] fit a "threshold" function with nls
Véronique,
in addition to Bert's comments, I wo
Véronique,
in addition to Bert's comments, I would like to bring to your attention
that there are several packages that perform
threshold/breakpoint/changepoint estimation in R, including
cumSeg, segmented, strucchange, and bcp for a Bayesian approach
Moreover some packages, such as cghFLasso
Véronique:
I've cc'ed this to a true expert (Ravi Varadhan) who is one of those
who can give you a definitive response, but I **believe** the problem
is that threshhold type function fits have objective functions whose
derivatives are discontinuous,and hence gradient -based methods can
run into t
I am trying to model a dependent variable as a threshold function of
my independent variable.
What I mean is that I want to fit different intercepts to y following 2
breakpoints, but with fixed slopes.
I am trying to do this with using ifelse statements in the nls function.
Perhaps, this is not an
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