After in the last post we looked how to get the data, now we are going to start analyzing it. The first question we are interested in is how quickly do houses sell. We don't have access to actual contracts, so we will use a proxy to measure this: how long is an ad­ver­tis­ment for a house still displayed. We are going to estimate that this is roughly the time it takes to sell a house.

We will do a cohort analysis, where each cohort will be composed of ads that were shown for the first time on that day and we will track what …continue.