Tagged Questions
0
votes
1answer
193 views
Interpreting Cluster Heat Maps From R
So I have been looking at how to plot high dimensional clustered data, and one of the options that come up is a heat map.
Although there are many webpages that provides code on how to create one, ...
2
votes
2answers
111 views
Visually plotting multi dimensional cluster data
I have a data set with 16 variables, and after clustering by kmeans, I wish to plot the two groups.
What plots do you suggest to visually represent the two clusters?
1
vote
2answers
220 views
R: Visualizing document clustering results
I have a k-means clustering result with 35 clusters, there are 5000 documents that each belong to one of the 35 cluster. I would like to visualize the results of the clustering algorithm on a scatter ...
4
votes
1answer
103 views
Index plot for each cluster sorted by the silhouette
After a cluster analysis I´m trying to plot for each cluster the Index plot of the Silhouette value instead of for the complete dataset
(like in the WeightedCluster Library Manual by Matthias ...
2
votes
0answers
128 views
Clusters produced by R intersect
I am new here - and relatively new to statistics, data mining and R. I am trying to understand why my data is not clustering correctly - or if I am reading it wrong. Shortly about the project:
My ...
6
votes
1answer
198 views
Evaluating clusters of first-order Markov chains
I clustered my dataset of several thousand first-order Markov chains into about 10 clusters.
Is there some recommended way how I can evaluate these clusters and find out what the items in the ...
2
votes
1answer
446 views
4
votes
2answers
283 views
Appropriateness of PCA to visualize clusters in genetic data
I've seen PCA improperly applied in genetic research quite often. I wanted to clarify : when is it appropriate to use PCA as a visualization tool in your analysis?
Some examples:
1) Rarely is the % ...
2
votes
1answer
63 views
Plotting decay in clustering?
I've got a method that produces clusters of elements and singletons. The singletons usually comprise about half of the initial element set, and there usually is a single biggest cluster of a several ...
3
votes
5answers
359 views
Looking for 2D artificial data to demonstrate properties of clustering algorithms
I am looking for datasets of 2 dimensional datapoints (each datapoint is a vector of two values (x,y)) following different distributions and forms ? Or is there any codes to generate such a datapoints ...
3
votes
0answers
69 views
R: looking for “time” clusters in a data set
I am new to R and seeking some advice. I have a set (~20M) of data describing on which step a process did fail or succeeded:
...
4
votes
2answers
622 views
How to plot results from text mining (e.g. classification or clustering)?
In text classification and clustering, the number of features are normally big, e.g. I currently get are around 5,000 features which is already really small compared to many other text mining tasks. ...
2
votes
0answers
174 views
Cluster similarity percentages with inverted Y-axis in R
I'd like to ask a question here that I've also asked on Biostar (stackexchange) and someone there forwarded me to this website. I was wondering how I could perform a Bray Curtis similarity clustering ...
7
votes
5answers
258 views
Dimensionality reduction technique to maximize separation of known clusters?
So let's say I have a bunch of data points in R^n, where n is pretty big (like, 50). I know this data falls into 3 clusters, and I know which cluster each data point is a part of. All I want to do is ...
5
votes
2answers
601 views
Visualizing multi-dimensional data (LSI) in 2D
I'm using latent semantic indexing to find similarities between documents (thanks, JMS!)
After dimension reduction, I've tried k-means clustering to group the documents into clusters, which works ...
6
votes
3answers
2k views
How to interpret mean of Silhouette plot?
Im trying to use silhouette plot to determine the number of cluster in my dataset. Given the dataset Train , i used the following matlab code
...
3
votes
3answers
1k views
How to plot data output of clustering?
HI,
I tried clustering a set of data ( a set of marks ) and got 2 clusters. I would like to graphically represent it. Bit confused about the representation, since I dont have the (x,y) cordinates.
...
5
votes
3answers
337 views
How to generate user-friendly summaries of cluster analysis?
I used BIRCH and HAC to do clustering on my data.
I want to now what type of information I can include in reports that my users can generate to get more insights on the clusters. I would have to dumb ...
4
votes
3answers
2k views
Plotting a heatmap given a dendrogram and a distance matrix in R
I have dendrogram and a distance matrix. I wish to compute a heatmap -- without re-doing the distance matrix and clustering.
Is there a function in R that permits this?
5
votes
1answer
740 views
Interpreting output of igraph's fastgreedy.community clustering method
With the help of several people in this community I have been wetting my feet in clustering some social network data using igraph's implementation of modularity-based clustering.
I am having some ...
17
votes
7answers
4k views
How to do community detection in a weighted social network/graph?
I'm wondering if someone could suggest what are good starting points when it comes to performing community detection/graph partitioning/clustering on a graph that has weighted, undirected edges. The ...
6
votes
2answers
1k views
Newman's modularity clustering for graphs
I am interested in running Newman's modularity clustering algorithm on a large graph. If you can point me to a library (or R package, etc) that implements it I would be most grateful.
best ~lara
13
votes
8answers
1k views
Visualization software for clustering
I want to cluster ~22000 points. Many clustering algorithms work better with higher quality initial guesses. What tools exist that can give me a good idea of the rough shape of the data?
I do want to ...
