Compute QB epa

add_qb_epa(pbp, ...)



is a Data frame of play-by-play data scraped using fast_scraper().


Additional arguments passed to a message function (for internal use).


Add the variable 'qb_epa', which gives QB credit for EPA for up to the point where a receiver lost a fumble after a completed catch and makes EPA work more like passing yards on plays with fumbles