If on a scatter plot, there is a cluster of points that follow a certain trend, and one lone point far away that also follows that trend, is that lone point an outlier?
The point away from the cluster would be an outlier because it is away from the points that are together and it is just not a part of them so it would be an outlier.
Answer: Since most of the clustering algorithms have a minimum threshold of data points to form a cluster, the outliers are the lone data points that are not clustered.
