Weapons of Math Destruction Quotes by Cathy O'Neil

It wasn’t so much about hiding the data at all costs but preventing harm from the way that data was used.

I will even add that it would be dangerous to attempt this comparison; for when statistics are not based upon computations which are strictly accurate, they mislead instead of guiding aright.

A second, and equally serious, concern is whether—even if a predictive model measured exactly what it claimed to—we are in practice using it for its intended purpose, or for something else.

A tool that is calibrated, she writes, “cannot have equal false positive and negative rates across groups, when the recidivism prevalence differs across those groups.”