LOF visualization
As with kNN distance scoring, a scatterplot can be a useful visual aid for understanding why a low or high score has been assigned. In this exercise, the LOF score is visualized by scaling the points according to the size of the score. You should notice some differences in the location of points with highest scores compared to kNN distance.
The wine
data for this exercise already contains the score
column appended in the previous exercise.
This exercise is part of the course
Introduction to Anomaly Detection in R
Exercise instructions
- Use a scatterplot to show
pH
againstalcohol
from thewine
data. The points should be shown as solid bullets whose size depends on the LOF score.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Scatterplot showing pH, alcohol and LOF score
plot(pH ~ alcohol, ___)