Displaying 20 results from an estimated 1000 matches similar to: "Fitting a mixed negative binomial model"
2010 Oct 25
2
Mixed-effects model for overdispersed count data?
Hi,
I have to analyse the number of provisioning trips to nestlings according to a number of biological and environmental factors. I was thinking of building a mixed-effects model with species and nestid as random effects, using a Poisson distribution, but the data are overdispersed (variance/mean = 5). I then thought of using a mixed-effects model with negative binomial distribution, but I have
2010 May 11
2
AEC - Echo is cancelled however.....
I usually use the cross-correlation between the speaker signal and the
mic signal.
It works pretty well. The problem is the you need enough data in order
to get a good S/N.
I compute the cross-correlation between 1.5 second data of each
signals. In this way the application detection of any anomalies is
quite slow.
I am looking for something faster, but I fear it will be something
very application
2005 Apr 05
2
GLMs: Negative Binomial family in R?
Greetings R Users!
I have a data set of count responses for which I have made repeated observations
on the experimental units (stream reaches) over two air photo dates, hence the
mixed effect. I have been using Dr. Jim Lindsey's GLMM function found in his
"repeated" measures package with the "poisson" family.
My problem though is that I don't think the poisson
2010 May 10
6
AEC - Echo is cancelled however.....
1) Everytime a participant speaks there is a echo for a short duration
(maybe a word or two) but as the participant continues to speak without a
any break the echo is 95% cancelled (i.e there is a feeble echo still
present if observed very carefully).
2) The moment the participant stops / pauses speaking and start talking
again, scenario 1 is repeated as if the echo state has been re-initialized
2010 May 11
2
AEC - Echo is cancelled however.....
2010/5/11 Elston Sa <jose at rebaca.com>:
> Is there an API in speex or have you implemented your own?
I don't know if there is an API in speex for this, probably not. There
is a test for AEC which does something very similar.
I implemented it starting from a FFT library. It is quite easy to do.
>
> I am currently trying to find one. But if you could point me to one it will
2010 May 10
1
AEC - Echo is cancelled however.....
Yes. I guessed that too, however I am not sure why it keeps repeating every
time the user stops / pauses and starts speaking again in a single session.
I am using a laptop with standalone speakers. For echo cancellation to work
one has to make sure that the ref and echo buffers are synchronized. I guess
this is the most common problem.
-Elston
-----Original Message-----
From: Anton A.
2006 Sep 05
1
help: advice on the structuring of ReML models for analysing growth curves
Hi R experts,
I am interested on the effects of two dietry compunds on the growth of
chicks. Rather than extracting linear growth functions for each chick and
using these in an analysis I thought using ReML might provide a neater and
better way of doing this. (I have read the pdf vignette("MlmSoftRev") and
"Fitting linear mixed models in R" by Douglas Bates but I am not
2006 Jan 24
4
nested ANCOVA: still confused
Dear R-users,
I did some more research and I'm still not sure how to set up an ANCOVA
with nestedness. Specifically I'm not sure how to express chicks nested
within boxes. I will be getting Pinheiro & Bates (Mixed Effects Models
in S and S-Plus) but it will not arrive for another two weeks from our
interlibrary loan.
The goal is to determine if there are urbanization (purban)
2006 Oct 05
4
glm with nesting
I just had a manuscript returned with the biggest problem being the
analysis. Instead of using principal components in a regression I've
been asked to analyze a few variables separately. So that's what I'm
doing.
I pulled a feather from young birds and we quantified certain aspects of
the color of those feathers. Since I often have more than one sample
from a nest, I thought I
2009 Jul 06
2
ReShape chicks example - line plots
Hi,
In the examples from the ReShape package there is a simple example
of using melt followed by cast that produces a smallish amount of
output about the chicks database. Here's the code:
library(reshape)
names(ChickWeight) <- tolower(names(ChickWeight))
chick_m <- melt(ChickWeight, id=2:4, na.rm=TRUE)
DietResults <- cast(chick_m, diet + chick ~ time)
DietResults
My challenge
2010 Feb 04
1
Zero inflated negat. binomial model
Dear R crew:
I think I am in the right mailing list. I have a very simple dataset consisting of two variables: cestode intensity and chick size (defined as CAPI). Intensity is clearly overdispersed, with way too many zeroes. I'm interested in looking at the association between these two variables, i.e. how well does chick size predict tape intensity?
I fit a zero inflated negat. binomial
2005 Apr 13
0
Summary: GLMMs: Negative Binomial family in R
Here is a summary of responses to my original email (see my query at the
bottom). Thank you to Achim Zeileis , Anders Nielsen, Pierre Kleiber and Dave
Fournier who all helped out with advice. I hope that their responses will help
some of you too.
*****************************************
Check out
glm.nb() from package MASS fits negative binomial GLMs.
2006 Aug 31
2
vim timestamp issues on CIFS mounted shares
First: this is my first post on this list so any suggestions, let me
know.
I recently had to make the move from SMBFS to CIFS when I upgraded from
Fedora 4 to 5. Changing settings in my /etc/fstab was easy and no
errors come up but now I'm having an issue very similar to post I found
on your list that got no response back in April:
http://lists.samba.org/archive/samba/2006-April/119813.html
2004 Apr 15
1
[vorbis virus spam] Any list ops ever thought... was re: Hey
...about maybe stripping all zip, exe, pif, etc attachments from emails
coming to vorbis@xiph.org? Granted, Ryan Ashley has a Very Valid Point and I
agree wholeheartedly about "Any idiot who opens a pif, exe, bat, com, or any
other executable file deserves what they get." and would actually encourage
these feeble minded folks to "Please, Open it and Darwinate your dumb self
2006 Mar 09
4
habtm questions
I''ve got some of this working but other parts are ellusive.
I have
CREATE TABLE `bags` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(255) NOT NULL default '''',
PRIMARY KEY (`id`)
CREATE TABLE `packages` (
`id` int(255) NOT NULL auto_increment,
`name` varchar(255) NOT NULL default '''',
PRIMARY KEY (`id`)
CREATE TABLE
2006 Nov 15
4
Mongrel 0.3.15 PR -- All The Fixes Good For You
Hi folks,
Getting much much much closer to the 1.0 release. I have some documentation to work on tonight, and I need to go through the patch queue one more time, but I''ve put up another pre-release for people to test.
What this pre-release does is pull together the various patches, monkey patching, and alternatives that make Mongrel either faster or more stable. It is also the start
2006 Mar 21
4
habtm > join()
I''m trying to pull ou the ''name'' field for each of my associated rows
and pass it as a string of names. I''m missing something obvious here
but I thought @bag.packages.name.join(", ") would work.
do I have to loop through @bag.packages? that seems like the long way.
thanks
-zac
--
Posted via http://www.ruby-forum.com/.
2006 Jan 27
2
simple stuff in rails rhtml
after playing with the DB interaction I''m moving on to doing some file
IO. but I''m completly lost as to where to put the code and how to call
it.
I''m trying to get a list of files in a directory and it''s not obvious to
me how to do this in Rails via a controller method.
so ruby code is
Dir.entries("testdir").last
and html code is
<%=
2006 Jan 22
1
regression with nestedness
Dear R-users,
I set up an experiment where I put up bluebird boxes across an
urbanization gradient. I monitored these boxes and at some point I
pulled a feather from a chick and a friend used spectral properties
(rtot, a continuous var) to index chick health. There is an effect of
sex that I would like to include but how would I set up a regression and
look at the effect of urbanization
2008 Jul 30
1
bug in 'margins' behavior in reshape - cast
according to the documentation of the cast function in the reshape function,
I would expect this bit of code from the examples to calculate marginal
means over only the 'diet' variable.
#Chick weight example
names(ChickWeight) <- tolower(names(ChickWeight))
chick_m <- melt(ChickWeight, id=2:4, na.rm=TRUE)
cast(chick_m, diet + chick ~ time, mean, margins="diet")
But,