# Questions tagged [biplot]

Biplot or dual plot is an exploratory graph to present - as points or vectors - both the observations (sample) and the variables of the data. The axes are typically latent principal dimensions. Biplot is often used to depict principal component analysis, correspondence analysis, and other multivariate methods.

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### What, if any, dissimilarity is preserved in partial least squares (PLS)?

When we perform a principal components analysis (PCA) on a multivariate data set we are interested in finding orthogonal components that explain maximal variance in the data set. We can form a biplot ...
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### Interpretation of biplot in PCA

Blue points all appear in the lower right-hand quadrant in the plane formed by the first two principal components. Is it a good interpretation of the biplot (right panel) to say that blue points are ...
86 views

### How to analyze this biplot of PCA?

I have dones a PCA analysis about measurement of a fish morphometric between female and male. After the PCA result came out with biplot graph, I was a little bit confused to interpret this data. It ...
3k views

### Difference beween supplementary and active variables in PCA - Interpretation on obsevations?

I would like to introduce two supplementary variables into a PCA I'm conducting on a set of data measuring concentration in different material phases. However I'm unclear as to how to interpret the ...
221 views

### Understanding biplot for compositional data

Say in the biplot of some compositional data, I discovered that the links $\vec{AB}$ and $\vec{CD}$ intersect at roughly 90 degrees. So I can say that $\log {A\over B}$ and $\log{C\over D}$ are ...
333 views

### Interpreting a PCA Biplot of a time series?

I had a question in regards to PCA with times series data, and specifically how to possibly interpret it. Normally, PCA is used by other software that I use in relation to de-noising a data set by ...
525 views

I'm running a multiple correspondence analysis in R using the FactoMineR package: ...
177 views

### I want to run a same result of biplot in R

There is a software called Brandmap$^1$ which can return a biplot from a matrix. I am trying to run the same result in R but the coordinates are not the same. First I input a simple matrix into the ...
906 views

### Angles between variables on a PCA biplot and correlations between the variables

A friend or mine has performed a PCA and he asked me for help about interpretating a biplot. In that biplot I found that the vector representing a variable, say A, forms a very wide angle, perhaps ...
1k views

I was investigating the interpretation of a biplot and meaning of loadings/scores in PCA in this question: What are the principal components scores? According to the author of the first answer the ...
553 views

### PCA - more than 2 principal components for >80% variance

I have analyzed some datasets using prcomp and some of my data is nice and amenable to PCA. But the summary of one set is showing that at least 6 components are needed to cover 80% of the variance. I'...
265 views

### PCA figure formatting options in R

I've completed PCA analysis, in R with VEGAN package, of some ecological data on tree health. There are 80 trees total (so, 80 'sites') divided into four treatment categories. I've got the data ...