Hierarchical Clustering

In a previous post I discussed k-means clustering, which is a type of unsupervised learning method.  Today I want to add another tool to our modeling kit by discussing hierarchical clustering methods and their implementation in R. As in the k-means clustering post I will discuss the issue of clustering countries based on macro data.  … More Hierarchical Clustering

Shaving a Classifier with Occam’s Razor

I recently went through a Coursera course on Classification taught by Carlos Guestrin from U of Washington and thought it was excellent.   There was an interesting discussion on model overfitting that I thought I would share. In previous posts I discussed linear models with shrinkage parameters such us ridge and lasso regression models. Similar approach … More Shaving a Classifier with Occam’s Razor