Purchase Frequency
Purchase frequency describes the number of purchases per customer over a defined period. It must take into account the consumption cycle and differences between populations. An apparent increase may result from a shift in purchases over time. Observing cohorts helps to interpret the continuity of behaviour.
A concrete example
Over a quarter, 600 orders for 200 active buyers corresponds to three orders per buyer. The result depends on the definition of an active buyer.
A point to consider
Comparing a three-month period to a twelve-month period is meaningless without adjustment. Take seasonality and new entrants into account.
Observe the order schedule
Supplement the average number of orders with the time between purchases. Analyze members who were present throughout the entire period separately from new members. After a sales event, also observe the following period: an immediate surge may correspond to orders brought forward. The conclusion depends on the cumulative effect and the margin over a sufficiently long period to cover the buying cycle.
Questions to ask your team
- Does the following period confirm the change in pace?
- Did the customers have the same duration of exposure to the programme?


