Breaks the data into the following categories, and imputes missing values based on rate stats across sources. For example, if passing attemts are missing then they will be imputed by calculating pass yards per attempt across sources and dividing the pass yards for the source with pass yards per attempt across sources.
Passing stats
Rushing stats
Receiving stats
Miscellaneous offensive stats
Return stats
Kicking stats
DST stats
IDP stats
stats_by_category(data_results)