Questions tagged [multi-dimensional-scaling]
84 questions
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How to carry out multidimensional scaling on 12-nations data set reported by Wish (1971)
I currently self-study multidimensional scaling. Amongst others, I study Borg & Groenen (2005): Modern multidimensional scaling : theory and applications.
On page 10, they present a real-life data set reported by Wish (1971). Wish (1971) asked 18…
DomB
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Add categories in MDS plot
I) PROBLEM
Let’s say I have a matrix like this with distances (in kilometers) between the homes of different people.
| | Person 1 | Person 2 | Person 3 |
|----------|----------|----------|----------|
| Person 1 | | | …
ag_1812
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Keep indices in a scatter plot of jaccard distance matrix
I have a disstance matrix and I wanted to plot it as 2D scatter plot.
I have found a way through sklearn.manifold:
mds = MDS(n_components=2, dissimilarity='precomputed')
X_r =…
Néstor
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Bring multiple 2d arrays [][] on same length
i have a huge Problem when dealing with jagged arrays [][].
I wrote a program that interacts with lots of CSV-files. It will read them and then compare them. Now i have a problem if Array A has the dimension of 10 Rows and 10 Columns but Array B…
christian890
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axis break in plot metaMDS
I have an abundance table of fungal species from 16 different samples (xylem tree tissue) belonging to three healthy classes.
I want to visualize the similarity of these samples according to the health class.
I have run metaMDS (vegan package) and…
Nanuk
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High-scale signal processing in R
I have high-dimensional data, for brain signals, that I would like to explore using R.
Since I am a data scientist I really do not work with Matlab, but R and Python. Unfortunately, the team I am working with is using Matlab to record the signals.…
Aman A.
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Multidimensional scaling to data in python
I have the following code to apply the multidimensional scaling to sample of data called parkinsonData:
iterations=4
count=0
while(count
mrc
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Manually build SIMPER contrast matrix from dataframe R
I am using the simper function from the vegan package. Briefly, simper compares a a set of groups and calculates what variables are contributing most to their dissimilarity, and also by how much, in a column named cusum that gives the cumulative…
J.Con
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Multidimensional scaling in R (done manually)
How to do multidimensional scaling by iterative majorization in R manually? Does anyone have an idea how to code Guttman`s transform?
AGMG
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Multi Dimensional Scaling
I'm trying to apply MDS to a distance matrix based on disagreements (namely it is the "voting" dataset in the "HSAUR" package.) I'm trying to reduce it to 2 dimensions and plot without the cmdscale() function, but can't get the same result when I…
Macky
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Relation between Centering matrix and multidimensional scaling
I try to understand the steps of multidimensional scaling, and the the method is based on the centering matrix, I do not understand what's his exact role
sam Black
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Plotly in Shiny Problems
I am having a few problems with my Shiny which uses plotly to present the Multidimensional Scaling results.. Below is my code. An answer to any of my questions would be great, thanks in…
user6578927
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How can I normalize data to have same average sum of square?
In a lot of articles in my field, this sentence has been repeated: " The 2 matrices has been normalized to have the same average sum-of-squares (computed across all subjects and all voxels for each modality)". Suppose that we have two matrices that…
F.K1
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How to make a multidimensional Hashtable
I have this data and I need to make an object out of it so I can easily read/write to this object.
I tried to make a dictionary and fill it with hashtables but it is very hard to maintain and I don't even know how to modify the data inside the…
medo ampir
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RandomForest proximity between training and test
Using randomForest, I want to create a low-level projection of the instance proximities, as produced by MDSPlot(). However, I not only want the training proximities, but proximities between all the instances (i.e. training and test). How can I do…
Andreas Maunz
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