Exercise

Assign daily acquisition cohort

As you have seen in the video, defining a cohort is the first step to cohort analysis. You will now create daily cohorts based on the day each customer has made their first transaction.

The data has been loaded as online DataFrame, you can now print its header with online.head() in the console.

Instructions

100 XP

Create a function by passing a datetime object extracting year, month and day from x.
Create a InvoiceDay column by passing the InvoiceDate columns and applying the get_day function.
Create a groupby object that groups CustomerID variable, and selects InvoiceDay for further calculations.
Create a CohortDay column by selecting the minimum InvoiceDay value.