Bingo! The classic work on this is from Fader and Hardie: https://faculty.wharton.upenn.edu/wp-content/uploads/2012/04/Fader_hardie_jim_07.pdf https://faculty.

Bingo! The classic work on this is from Fader and Hardie: https://faculty.wharton.upenn.edu/wp-content/uploads/2012/04/Fader_hardie_jim_07.pdf https://faculty.wharton.upenn.edu/wp-content/uploads/2012/04... A friend and I made an implementation in Python a while back: https://github.com/chrisclark/retentionizer https://github.com/chrisclark/retentionizer