How to interpret multiple inflection points on a Usage Interval chart?

  • 13 December 2022
  • 2 replies

Userlevel 3
Badge +2

Hi Amplitude Community, 

This month we’re sharing product knowledge share articles from the technical support team at Amplitude! Through these articles, we hope to share some tips and tricks for using Amplitude that we have come to learn ourselves over the past quarter. 



How to interpret multiple inflection points on a Usage Interval chart?


The Usage Interval of your product is an important concept we use here in Amplitude in retention analysis. You might want to check out our Mastering Retention playbook (https://amplitude.com/mastering-retention/critical-event-product-usage-interval) and our blog post (https://amplitude.com/blog/product-usage-interval) to understand more about this concept. For users on our Scholarship and paid plans, the Usage Interval View in the Retention chart is useful to find the usage interval for your product’s critical event. 


In our documentation of the feature (https://help.amplitude.com/hc/en-us/articles/360050153551-Interpret-your-retention-analysis#interpret-your-retention-analysis-chart-usage-interval-view ), we shared that in the chart below, the inflection point on Day 4 can be interpreted as your usage interval: 




A customer wrote in recently when they observed that the Usage Interval View chart they had showed multiple inflection points, and they were wondering how to interpret these:




In cases like this, all three of these points would be considered inflection points. These inflection points represent significant breakpoints where retention changes from the current path.


Another tip we communicated was to set a custom Y-axis and zoom into the chart and get a closer look at precisely where the chart is leveling off (i.e. where the inflection points are). In the chart below where the max value of the Y-axis has been sent to 10%, the inflection points become even clearer: 




We hope this article has been insightful in some ways! We do release FAQs that contain other useful tips and tricks that will help you get the most value out of Amplitude: https://help.amplitude.com/hc/en-us/sections/360013877471-FAQs 


Have you learned anything new about Amplitude recently? Share your favorite learning or hack below! 

2 replies

Userlevel 6
Badge +9

This is super valuable! Thanks for posting! 😁


Hi team, this is really useful post which is answering to some of the questions I’m currently struggling with.

One thing that I keep running in to with most of my Usage Interval charts is the fact that they never reach a 100% on the last day of the chosen interval (usually 60 days), even though I clearly state in the segmentation part that only users who performed that returning action 2 or more times in the same time period should be taken into consideration.

I was expecting to see a 100% by the last day but it’s never the case.


Do you have any idea why this is the case?

What am I missing?