Displaying 20 results from an estimated 176 matches for "centroide".
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centroid
2008 Aug 19
4
spatial probit/logit for prediction
Hello all,
I am wondering if there is a way to do a spatial error probit/logit model in R? I can't seem to find it in any of the packages. I can do it in MATLAB with Gibbs sampling, but would like to confirm the results. Ideally I would like to use this model to predict probability of parcel conversion in a future time period. This seems especially difficult in a binary outcome model
2006 May 08
1
finding centroids of clusters created with hclust
Hello,
Can someone point me to documentation or ideas on how to calculate the
centroids of clusters identified with hclust ?
I would like to be able to chose the number of clusters (in the style of
cutree) and then get the centroids of these clusters.
This seems like a quite obvious task to me, but I haven't been able to
put my hands on a relevant command.
Thank you,
Moritz
2006 Mar 25
2
pairwise combinatons of variables
Dear WizaRds,
although this might be a trivial question to the community, I was unable to
find anything solving my problem in the help files on CRAN. Please help.
Suppose I have 4 variables and want to use all possible combinations:
1,2
1,3
1,4
2,3
2,4
3,4
for a further kmeans partitioning.
I tried permutations() of package e1071, but this is not what I need. Thank you
for your help and
2008 Jul 03
1
Otpmial initial centroid in kmeans
Helo there. I am using kmeans of base package to cluster my customers. As
the results of kmeans is dependent on the initial centroid, may I know:
1) how can we specify the centroid in the R function? (I don't want random
starting pt)
2) how to determine the optimal (if not, a good) centroid to start with? (I
am not after the fixed seed solution as it only ensure that the
2009 Dec 10
1
question about centroid-linkage (cluster analysis)
Dear R community,
I would be greatful if somebody could shed light on the following.
I have created a set of 6 points to check how centroid
agglomeration works in cluster analysis:
> Y <- data.frame(x=c(-1,1,1,-1,10,12),y=c(1,1,-1,-1,0,0))
It is quite intuitive to understand that the last clusters to be joined will be
{1,2,3,4} with {5,6}. Now, the centroid for the first cluster has
2004 Jul 13
0
Calculating sum of squares deviation between 2 similar matrices
Hi all,
I've got clusters and would like to match individual records to each
cluster based on a sum of squares deviation. For each cluster and
individual, I've got 50 variables to use (measured in the same way).
Matrix 1 is individuals and is 25000x50. Matrix 2 is the cluster
centroids and is 100x50. The same variables are found in each matrix
in the same order. I'd like to
2009 Feb 05
1
Does the "labpt" object in the Polygons-class represent the centroid of the polygon
Hello,
I need to calculate the centroids of some spatial polygons that I have
placed into a Polygons-class object. Is the labeling point in the
Polygons-class the centroid of the polygon?
Thank you for your help.
2012 Nov 18
1
centroid of hclust
Dear UseRs,i want to find centroid of clusters, which i generated by hclust. Is there a way doing that? i took mean to elements in each cluster to get centroid but i am not sure if i am right?
thanks in advanceeliza
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2008 Feb 04
1
how to get points from SpatialPolygonsDataFrame
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2008 Jun 02
1
LDA and centroids
Hello,
I have carried out an lda analysis using the lda function of MASS
package. I have plotted the LD1xLD2 to represent the data. Now I would
like to get the centroids for each group of data and plot it on the
LD1xLD2 graph. How can I get the centroid value from the lda object?
Best,
Dani
--
Daniel Valverde Saub?
Grup de Biologia Molecular de Llevats
Facultat de Veterin?ria de la
2011 Apr 27
1
centroid representation and MANOVA
hi all.
I have a matrix of data with 5 different groups and 20 individual
response per group, and about 12 variables collected for each. I want to
represent the result in a 2D plot. PCA is not so good because the
difference between the groups is not obvious. I have seen, in a recent
paper, people doing a MANOVA and representing it in a centroid plot
(they used Matlab to do it).
I would like
2012 Jul 04
1
Error in hclust?
Dear R users,
I have noted a difference in the merge distances given by hclust using
centroid method.
For the following data:
x<-c(1009.9,1012.5,1011.1,1011.8,1009.3,1010.6)
and using Euclidean distance, hclust using centroid method gives the
following results:
> x.dist<-dist(x)
> x.aah<-hclust(x.dist,method="centroid")
> x.aah$merge
[,1] [,2]
[1,] -3 -6
2012 Oct 21
1
Linear discriminant function analysis based median as group centroid and nonparametric scale estimators???
Dear All,
I am using a specific approach for my master thesis. In essence, a
supervised reclassification is used as an intermediate step to find chemical
parameters which are able to reclassify defined groups. These variables will
be used in a next step where location and scale estimators of the groups are
important. Traditionally linear discriminant analysis is used for
reclassification which
2016 Jul 26
3
K MEANS clustering
Hello,
I've been working on the KMeans clustering algorithm recently and since the
past week, I have been stuck on a problem which I'm not able to find a
solution to.
Since we are representing documents as Tf-idf vectors, they are really
sparse vectors (a usual corpus can have around 5000 terms). So it gets
really difficult to represent these sparse vectors in a way that would be
2016 Mar 12
2
GSOC-2016 Project : Clustering of search results
On Sat, Mar 12, 2016 at 04:27:55PM +0530, Richhiey Thomas wrote:
> Below I write a raw version of my proposal for Clustering of Search Results
> based on our previous mails.
Hi, Richhiey. Thanks for putting this together ahead of the formal
start of applications, and sharing it with us -- and it's really not
too long! Project proposals for something that will last the summer
are
2013 Jan 01
3
translate grouped data to their centroid
Given a data set with a group factor, I want to translate the numeric
variables to their
centroid, by subtracting out the group means (adding back the grand means).
The following gives what I want, but there must be an easier way using
sweep or
apply or some such.
iris2 <- iris[,c(1,2,5)]
means <- colMeans(iris2[,1:2])
pooled <- lm(cbind(Sepal.Length, Sepal.Width) ~ Species,
2001 Nov 19
3
dist
Hi list!
I'm computing multivar. distances from a set of centroids
to a (large) set of individuals. I'm now just using rbind
to create a matrix (x) with the centroid and the individuals,
then run as.matrix(dist(x)) and finally select the appropriate columns,
as I'm not interested on the distances among individuals.
Therefore, this procedure implies a waste of computing time.
Is there
2005 Jul 26
0
Hierarchical clustering with centroid method
Dear everybody!
In the function hclust, at each stage distances between clusters are recomputed by the Lance-Williams dissimilarity update formula according to the
particular clustering method being used.
Using "centroid" method, Lance-Williams recurrence formula works properly only for euclidean distance.
How is it possible to use properly centroid method with manhattan distance ?
2006 Feb 28
0
Canonical Values and Centroids for MANOVA plots
Hey, all, I'm trying to construct a centroid plot using canonical
values from a MANOVA. I know that from the summary.manova object you
can get Eigenvalues, and the H and E matrices (from SS$Treatment and
SS$Residuals), but I am at a loss to get the loadings for the canonical
values, nor values for the centroid centers and radii. Is there a
package that does this that I am just missing,
2003 Sep 16
0
hclust: median, centroid (PR#4195)
There seems to be a bug in hclust (package mva) for clustering
methods 'median' and 'centroid'.
I have written a clustering program in C and discovered that the
results for 'median' differ from those of hclust in R. I used a
third program, written by someone else in Pascal, and that
program agrees with the output of my program.
I found yet another clustering program that