Adam Hoelscher, ASA, MAAA

https://stackoverflow.com/users/2142248/adam [email protected]

Seattle Actuary with experience in statistical analysis, data governance, and predictive modeling working as a data scientist.

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                                            Adam Hoelscher, ASA, MAAA

Refactor auc to avoid multiplication

Multiplying n_pos and n_neg can result in integer overflow. A little algebraic manipulation can avoid the multiplication, removing the possibility of overflow.