What is COHORT Analysis? How to read a COHORT chart?

 

Cohort analysis means grouping customers or users or any category which has something in common and tracking their behavior or values over time.




Example: 

How Much Do Kids Study day by day based on their joined date?

Imagine a teacher wants to understand how consistently students study each day.

The teacher groups students based on when they joined the study program.




How do we read this chart?


Monday Joined group:

These kids started on Monday. We follow them for several days and see the study time decreased over time for the 1st batch.

Monday → 2 hrs → 2 hrs → 1.5 hrs → 1 hr

 

Tuesday Joined group:

They started one day later, so we only have data for fewer days and they are inconsistent.

Tuesday → 1.5 hrs → 2 hrs → 1.5 hrs

 

Wednesday Joined  group:

They just started, so we only have a couple of days of data.

Wednesday → 2 hrs → 1.5 hrs

 

This chart is useful for seeing the progress over time for each batch.

This chart is useful for seeing time based progression for each groups.

Cohort = a group that started at the same time. We Group them → Track them → Compare them over time.

For example, the teacher might discover:

"Kids who joined on Monday has study time decreased each day than kids who joined on Tuesday."

That's cohort analysis.

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