To study churn, we need to look at a particular group of customers that signed up in a particular time period. We refer to these groups as cohorts. So you might have a Jan 2014 cohort which is comprised of all the customers that signed up in Jan 2014. We will then want to track how many customers we retain, and how the revenue for each cohort evolves over time. Here is a graph that shows what happens to the number of customers in a particular cohort over several years with three different monthly Customer Churn Rates.
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The median average contract length is 1.3 years and the average billing term is seven months in advance in 2016. Comparable to 2015, with average contract length shortening from 1.5 to 1.3 years and average billing period increasing by one month from 2015 to 7 months
Between the SMB and Enterprise customer types, the top-quartile performers not only have net-revenue churn that is 14% to 23% percentage less than the average performers but also have net-revenue churn that is negative in an absolute sense