Start pesudo-CR work

started adding some ideas for calculating pseudoCR as well as testing
beta. Not sure best way to find var (i.e. beta) with multiple columns?
Do we want variance across 0 and 1 for each category of low instances
or the 0 and 1 each have their own beta value for one single category?
Can do least sum square test to find best beta value - once we get
there…