Survey: How do you measure and analyze retention?

Curious to learn how people are analyzing retention for their products.

I'd love to compare notes as to how you are approaching/measuring/managing retention. Started with a simple survey, would appreciate if you could complete.

https://tinyurl.com/y8x6y2uc
(Clickthrough link: https://vincehuang.typeform.com/to/IoyYOy)

Be happy to share the results with the community after the first 100 results!

Happy Thanksgiving!