Predicting Customer Churn both with and without Machine Learning by @jmsmistral and @dbatalov

Customer Churn is a fairly standard thing to want to know for any business.  However do you know how to calculate it correctly and how to interpret the results?  Here are two excellent articles that can help you whichever method you choose.  Both are great and I advise people to read them both and decide your method based on what you have access to.

Predicting Customer Churn with Amazon Machine Learning by Denis V. Batalov

and

Predicting Churn without Machine Learning by Jonathan Sacramento