Hello,
I'm following this, since it seems I'm having to try to get C code going in
order to estimate dynamic models from biological data.Without saying
that gsl and related packages are proving to be obdurate, and knowing that R
is proving to be an excellent solution to the widest range of
Hello,
I would like to ask about the statistic used for initial values for models
built with grofit. Is the mean (of the experiments or cases) at t1 used?
Also at the other time points?
regards,
Russell
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__
to the approximately 12
that we read will give us a basic regression?
regards,
shfets
On Mon, Mar 22, 2010 at 2:43 PM, alexander russell ssv...@gmail.com wrote:
Hello,
I'm trying to understand grofit's estimation of models, and fairly new to
growth models generally. The data used by grofit consists
Hello,
I'm trying to understand grofit's estimation of models, and fairly new to
growth models generally. The data used by grofit consists of the vector of
experiments, that is the growth values for a vector of individuals
measured at different times. Can I understand correctly that the program
Hello,
Mle2 is a little unforthcoming in the matter of standard errors? Is there a
way to ask the program to supply standard errors along with estimates in
cases when it doesn't print them 'voluntarily'?
regards,
s
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-- Forwarded message --
From: alexander russell ssv...@gmail.com
Date: Tue, Oct 20, 2009 at 4:34 PM
Subject: Re: [R] When modeling with negbin from the aod package...
To: Matthieu Lesnoff matthieu.lesn...@gmail.com
Hello again,
It seems that, though we have a simple estimate
Hi,
When modeling with negbin from the aod package, parameters for a given count
y | lambda~Poisson(lambda)
with lambda following a Gamma distribution Gamma(r, theta)
are estimated.
The intercept is called phi.
Some other parameters may be also be estimated from factors in the
data: the
Hello,
After putting together interaction code that worked for a single pair of
interactions, when I try to evaluate two pairs of interactions(
flowers*gopher, flowers*rockiness) my computer runs out of memory, and the
larger desktop I use just doesn't go anywhere after about 20 minutes.
Is it
Hello,
I'd like to ask: going on from Richard McElreath's coursework in which he
says(my paraphrase) basically that the constancy with which a parameter
appears satisfactory with respect to its standard error over a series of
different models is a good measure of its usefulness, where is the
Hello,
Is there a clearcut answer as to why R prints 'NA' sometimes instead of
standard errors?
mle2(minuslogl = nlikfun4, start = list(a = 1, c = 1, d = 0.2,
b = 0.1, b1 = 0.1), method = Nelder-Mead)
Coefficients:
Estimate Std. Error z value Pr(z)
a 3.83845751 0.47320236 8.1117 4.993e-16
Hello,
I'd like to say that it's clear when an independent variable can be ruled
out generally speaking; on the other hand in R's AIC with bbmle, if one
finds a better AIC value for a model without the given independent variable,
versus the same model with, can we say that the independent variable
Hello,
I'd like to obtain parameters for my poisson data. Having made the function
poisregfun = function(a,b) {Y.pred = exp(a + b*x) - sum(dpois(y, lambda =
Y.pred, log = TRUE))}
where Y is a vector of data to be regressed on another vector x.
I'm asking for
mle2( poisregfun, start = list(a =
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