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
80 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
  • 153
1 vote
0 answers
59 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
0 votes
0 answers
26 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
0 votes
0 answers
10 views

Interpret PCA biplots in a practical setting [duplicate]

Background I have a dataset consisting of multiple time series. Each measures the ratio between concentrations of some elements over the same line segment of some bone object. The theory predicts that ...
Fabric's user avatar
  • 21
24 votes
1 answer
14k 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
24 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
  • 241
14 votes
1 answer
25k views

What do the arrows in a PCA biplot mean?

Consider the following PCA biplot: ...
Luna's user avatar
  • 2,335
7 votes
1 answer
24k 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
  • 257
4 votes
1 answer
11k 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
7k 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
  • 2,131
5 votes
1 answer
501 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
  • 469
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