Exercise

# How many components are relevant?

The results that you stored in `pcaNews`

contain as many components as variables. But your goal is a dimension reduction. It's time to find out how many components you should extract. Use several approaches to make your decision.

The results of the pca `pcaNews`

are still loaded in your workspace. All necessary packages are loaded.

Instructions

**100 XP**

- Create a screeplot. How many components does it suggest?
- How many components would you need to meet the criterion of 70% variance explained (take a look at the
`summary()`

)? - How many components would you extract according to the Kaiser-Guttmann criterion?