User blog comment:Sirebel/Mathematician Required - Apply Within/@comment-27170954-20170425003411/@comment-27170954-20170426141903

GRRR - just wrote a detailed response, but the page timed out and it wouldn't post.

short answer - your approach would probably provide an answer good enough for a game, but the regression approach (even to estimate all 26 upgrades independently) would be more efficient, require less data, and would come with information supporting the accuracy of the estiamtes.

In a few days I'll have a template to calculate all 26 upgrades and the base PR independetly. when i think it is ready, i'll share it and ask for help populating it.