Linked Questions

3 votes
0 answers
5k views

How to interpret ggbiplot() visualization of PCA in R? [duplicate]

To apply and visualize PCA in R often ggbiplot() is used. What is the meaning of this plot ? Why it is useful for PCA ? We can consider this example: https://tgmstat.wordpress.com/2013/11/28/...
Ef_Ci's user avatar
  • 131
1 vote
0 answers
108 views

Interpreting results of PCA [duplicate]

I've recently started an introductory machine learning course and the first topic we have covered is prinicpal component analysis (PCA) and overall I am finding the whole topic quite tricky to wrap my ...
TerryStone's user avatar
1 vote
0 answers
84 views

How to interpret a PCA Biplot? [duplicate]

I constructed a PCA plot from a very high-dimensional dataset that contains features relating to fraud. After creating the PCA plot, I created a biplot with the features to see how they interact. The ...
softmax55's user avatar
  • 173
0 votes
0 answers
30 views

Interpretation of pca plot [duplicate]

I am looking at an example of using PCA: https://wiki.q-researchsoftware.com/wiki/Principal_Components_Analysis_Biplot Specifically, Example 2 has data What are the points I'm looking at the biplot? ...
Primoz's user avatar
  • 101
24 votes
1 answer
15k views

Positioning the arrows on a PCA biplot

I am looking to implement a biplot for principal component analysis (PCA) in JavaScript. My question is, how do I determine the coordinates of the arrows from the $U,V,D$ output of the singular vector ...
ktdrv's user avatar
  • 450
25 votes
2 answers
18k views

What are the four axes on PCA biplot?

When you construct a biplot for a PCA analysis, you have principal component PC1 scores on the x-axis and PC2 scores on the y-axis. But what are the other two axes to the right and the top of the ...
Nils's user avatar
  • 251
14 votes
1 answer
26k views

What do the arrows in a PCA biplot mean?

Consider the following PCA biplot: ...
Luna's user avatar
  • 2,355
9 votes
1 answer
26k views

How to interpret this PCA biplot?

I am approaching PCA analysis for the first time, and have difficulties on interpreting the results. This is my biplot (produced by Matlab's functions pca and ...
umbe1987's user avatar
  • 297
4 votes
1 answer
12k views

What are the units in this PCA biplot? [duplicate]

This is a plot of my data These are the values: ...
Adrián A.D.'s user avatar
3 votes
1 answer
8k views

Interpretation of PCA biplot?

I just ran my first ever PCA, so please excuse any naivety on my part. As input, I used five years worth of the following: S&P/ASX 200 A-REIT S&P/ASX 200 Consumer Discretionary S&P/ASX ...
CuriousCat's user avatar
7 votes
0 answers
3k views

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 ...
user7064's user avatar
  • 2,207
5 votes
1 answer
553 views

Interpreting PCA figures in layman terms

Image you have to present your PCA findings to a managerial board. An example: After having read answers from here, I've understood that The left and bottom axis are correlations The right and ...
Amir Rahbaran's user avatar
1 vote
0 answers
2k views

Confused about scores and loadings in this PCA biplot

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 ...
Anni's user avatar
  • 499
1 vote
0 answers
2k 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 ...
mmv's user avatar
  • 61