# What does Make Density Based Clusterer in Weka do?

In Weka, there is a clustering algorithm with the name as Make Density Based Clusterer. When going through its properties, it takes a clusterer as base clusterer(I took it as K-means with k=3). It initially performs k-means and creates three clusters. I see prior probabilities for each cluster and attribute-wise normal distribution means and standard deviation in the result buffer.

What happens after k-means clusters are calculated? What role mean, standard deviation and prior probabilities play here? Why is it called density based?

Based on this paper, MakeDensityBasedClusterer is a metaclusterer that wraps a clustering algorithm to make it return a probability distribution and density. To each cluster and attribute, it fits a discrete distribution or a symmetric normal distribution (whose minimum standard deviation is a parameter).