Average time between in Heap measures the average time it takes for a user to complete Event 2 after performing Event 1.
Example: A designer for an eCommerce site must determine whether or not the user experience for adding a product to a cart is intuitive for users. To get a sense of this, they want to measure the average time it takes for a user to look at a product page (PDP page) and then add an item to the cart. When reviewing our data, we see 3 users who performed the following actions:
User 1: View PDP 10:00, Click Add to Cart 10:05, View PDP 10:15, View PDP 10:16
User 2: View PDP 11:00, Viewed PDP 11:05, Click Add to Cart 11:20
User 3: View PDP 10:00, Click Add To Cart 10:05, View PDP 10:10, Click Add To Cart 10:20
To calculate the average time, we look for AB pairs, meaning sets of users who completed Event 1 and Event 2 together. In this example, User 1 has 1 AB pair that took a total time of 5 minutes.
When, calculating the average of the AB pairs, 5 minutes goes in the numerator to calculate our total duration, and 1 will go into the numerator to represent one AB pair.
User 2 also has one AB pair:
Which means we can update our equation as follows:
User 3 performs this set of actions twice, so they have 2 pairs:
Using this information in our equation, the average time for this particular set of users is 8.75 minutes.