CODEWITHSUNDEEP
rpca
Achal Neupane
Achal Neupane

Reputation: 5719

How to plot variance of Principal components in dataframe format?

I am trying to plot something like this shown below, but with dataframe object. My eigenvalues are in DF format as below. How can we get this plotted?

library("factoextra")
data(iris)
res.pca <- prcomp(iris[, -5],  scale = TRUE)
# Extract the  eigenvalues/variances
get_eig(res.pca)
fviz_eig(res.pca, geom="line")

enter image description here

DF <- as.data.frame(res.pca$x)

Upvotes: 1

Views: 245

Answers (1)

jared_mamrot
jared_mamrot

Reputation: 26495

You can calculate the proportion of explained variance like this:

library(factoextra)
library(tidyverse)

data(iris)
res.pca <- prcomp(iris[, -5],  scale = TRUE)

DF <- as.data.frame(res.pca$x)

new_DF <- tibble(`Percentage of Variance Explained` = c(sd(DF$PC1)^2 / 4,
                                              sd(DF$PC2)^2 / 4,
                                              sd(DF$PC3)^2 / 4,
                                              sd(DF$PC4)^2 / 4),
                 Dimensions = 1:4)
ggplot(new_DF, aes(x = Dimensions, y = `Percentage of Variance Explained`)) +
  geom_line() +
  geom_point() +
  scale_y_continuous(labels = scales::percent_format())

example.png

Upvotes: 2

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