Displaying 20 results from an estimated 10000 matches similar to: "question about mclust and prior probabilities"
2007 Jun 28
0
prior covariance in Mclust
Hello,
I'm trying to use Mclust to fit a Gaussian Mixture Model to a
mulitdimensional data set.
Because of the specific source of my data, I know that all components
have the same variance and that the covariance between dimensions is
zero (modelname=VII).
Furthermore, I have a reliable estimate of the variance of the components.
I want to to use this estimate as a prior in mclust, hoping
2005 Oct 22
0
package mclust: cdens, EMclust?
Dear Knowledgeable R Community Members,
Please excuse my ignorance -- I apologize in advance
if this is an easy question, but I am a bit stumped
and could use a little guidance regarding parameters
in 2 functions in the "mclust" package.
--------------------
PROBLEM DESCRIPTION
--------------------
I have a finite mixture modeling problem -- for
example, a 2-component gaussian
2009 Dec 04
0
flexmix and mclust help
Hello,
I'm trying out flexmix and mclust for the first time on some univariate data
which is typically best described as lognormal, but can sometimes be gamma
distributed as well. I first tried using EM on mclust assuming the data was
lognormally distributed and could only get it to work in "E" mode, i.e. the
equal variance mode. I could never get it to work on "V" mode [
2011 Sep 03
2
mclust: modelNames("E") vs modelNames=("V")
Hi,
I'm trying to use the library mclust for gaussian mixture on a numeric
vector. The function Mclust(data,G=3) is working fine but the fitting is not
optimal and is using modelNames="E". When I'm trying
Mclust(data,G=3,modelName="V") I have the following message:
Error in if (Sumry$G > 1) ans[c(orderedNames, "z")] else ans[orderedNames] :
argument is
2004 Jun 14
2
A Few MCLUST Questions
Hello everyone. I have a few MCLUST questions and I was hoping someone could help me out. If you’re an MCLUST user, they will likely be pretty easy to answer. Thanks in advance for any help.
Ken
What are the pros/cons of starting a finite mixture model at the “m” step versus the “e” step (where “m” is the maximization step and “e” is the expectation step of the EM algorithm)? In
2010 Mar 22
0
superfluous distribution found with mclust
Dear R users,
I use mclust to fit a mixture of normal distributions to many datasets. Usually the Mclust function finds 1 or two normal distributions, rarely, 3.
But I hit a strange case today.
my.data <- c(57.96920, 51.79415, 51.20538, 55.53637, 51.64291, 56.61476, 51.28855, 55.56169, 51.85113, 54.03330, 51.37370, 49.48561, 52.41580, 53.51176, 60.49293, 55.77012, 51.59270, 56.29660,
2011 Sep 04
2
mclust: modelName="E" vs modelName="V"
Hi,
I'm trying to use the library mclust for gaussian mixture on a numeric
vector. The function Mclust(data,G=3) is working fine but the fitting is not
optimal and is using modelNames="E". When I'm trying
Mclust(data,G=3,modelName="V") I have the following message:
Error in if (Sumry$G > 1) ans[c(orderedNames, "z")] else ans[orderedNames] :
argument is
2007 Oct 03
0
help with mclust
Dear all,
I am attempting to model some one-dimensional data using Gaussian
mixture model with mclust. Generally, the data that I have have 3
overlapping populations (with one of them being the majority, and the
other two combining to less than 15%) and for some reason, mclust
consistently ignores the smaller peaks, giving me strange values for the
means (completely anti-intuitive in terms of
2007 Oct 03
1
FW: help with mclust
> No HTML this time. Sorry
Dear all,
I am attempting to model some one-dimensional data using Gaussian mixture model with mclust.? Generally, the data that I have have 3 overlapping populations (with one of them being the majority, and the other two combining to less than 15%) and for some reason, mclust consistently ignores the smaller peaks, giving me strange values for the means
2008 Mar 26
0
out of colors in Mclust with 12 clusters
I'm running Mclust 3.0 in R-2.7.0 and have run into a situation where
the optimal number of clusters, 12, seems to be greater than the number
of colors available to Mclust. The code below, which demonstrates
errors, does not if the max no of clusters is set at 10. sessionInfo,
after a restart of R and loading of packages, follows the output.
Is this a known problem with Mclust? Can I
2004 Jun 07
2
MCLUST Covariance Parameterization.
Hello all (especially MCLUS users).
I'm trying to make use of the MCLUST package by C. Fraley and A. Raftery. My problem is trying to figure out how the (model) identifier (e.g, EII, VII, VVI, etc.) relates to the covariance matrix. The parameterization of the covariance matrix makes use of the method of decomposition in Banfield and Rraftery (1993) and Fraley and Raftery (2002) where
2006 Oct 06
0
new version of mclust available
A new version of mclust is now available as a contributed package on CRAN.
The associated manual is located at
http://www.stat.washington.edu/www/research/reports/2006/tr504.pdf
The main feature in terms of new functionality is the option to include
a Bayesian prior in the mixture model for regularization.
The older version is still available mclust02 for those who need
backward compatibility.
2003 Dec 18
3
mclust - clustering by spatial patterns
Dear All,
I have spatial data (presence/absence for 4000 squares) on 250 bird
species and would like to use a model-based clustering technique to
test for species associations. Is there any way of passing a
distance/correlation matrix to mclust as with hclust, rather than the
actual data? Or alternatively, is there a way of getting mclust to
handle binary data?
I'd appreciate any
2012 Nov 26
0
cluster analysis error - mclust package
I am following instructions online for cluster analysis using the mclust
package, and keep getting errors.
http://www.statmethods.net/advstats/cluster.html
These are the instructions (there is no sample dataset unfortunately):
# Model Based Clustering
library(mclust)
fit <- Mclust(mydata)
plot(fit, mydata) # plot results
print(fit) # display the best model
This is what I did and the error I
2008 Jul 21
1
Mclust - which cluster is each observation in?
I'm trying to test a method of identifying individuals (birds) based on
measured data (their calls).
I have test data from known individual birds, and I am using the Mclust
package to see if the program can correctly identify which calls come from
different birds.
So far, mclust has correctly ID'd the number of birds in the test data set
(i.e., the correct # of clusters). However I
2003 Nov 15
0
r 1.7.1, MacOS 9.2.2, mclust 2.0-2 (Update), lapackLib
I am new to r and mclust.
I have version 1.7.1 of r, precompiled for Classic Mac OS (I am running 9.2.2 on a PowerBook G4).
I downloaded the precompiled version 2.0-2 of mclust for Classic MacOS.
It appears (from the example I was using below) that I need a library called lapackLib. There does not appear to be a precompiled version at CRAN. There is a makefile for lapackLib, to use with MPW.
2005 Jul 19
1
Library mclust in 64bit compiled R
Hi, All;
I tried to use library mclust in 64-bit compiled R 2.0.1 but failed.
Installation went smoothly without any warning or error. However, when I
tried to use them with the following simple code, it crashed.
Library(mclust)
Dat <- c(rnorm(20, mean=0, sd=0.2), rnorm(30, mean=1, sd=0.2))
Ind <- Mclust(dat, 1, 5)$classification
cbind(Dat, Ind)
The error message was:
2003 Aug 05
2
Error on mclust
Hi All,
I am trying to cluster a one-dimensional data (see the file attached) using
Mclust() but got an error message like:
>Mclust(x)
Error in rep(1, n) : Object "n" not found
When I do a simulation sometimes it works sometimes doesn't.
>Mclust(c(rnorm(50),rnorm(56,-0.5)))
Error in rep(1, n) : Object "n" not found
>Mclust(c(rnorm(56),rnorm(56,-0.5)))
best
2007 Mar 23
0
plotting dnorm() issued from mclust models
Dear all
I have a problem in fitting lines() of the normal distributions
identified with Mclust on a histogram or a mclust1Dplot. Here is some
sample code to explain :
set.seed(22)
foo <- c(rnorm(400, 10, 2), rnorm(500, 17, 4))
mcl <- Mclust(foo, G=2)
mcl.sd <- sqrt(mcl$parameters$variance$sigmasq)
mcl.size <- c(length(mcl$classification[mcl$classification==2]),
2008 Jun 12
0
using MCLUST package to estimate a poisson-gaussian process
Hi All,
I am using em() function to estimate a poisson-gaussian process from a
univariate one dimension time series, but not sure how to do. In the help
manual, it specify that in "pro" of the argument "parameter", if the model
includes a Poisson term for noise, there should be one more mixing
proportion than the number of Gaussian components. But in the example, the
parameter