ROBIN HOOD MATH

Bounding through the forest of data, wielding math to right wrongs.

Giansiracusa, associate professor of mathematics at Bentley University, describes his newest work as an educational book about math, but those who freeze at the mention of mathematics can take heart—this reads like a good yarn. Full of engaging stories about how ideas about calculation took shape, it reveals how algorithms intersect with our everyday lives. Channeling Robin Hood, the 14th-century English outlaw and folk hero who took from the careless rich and gave to the deserving poor, the author tells us how we can all begin using math to take back control from large tech companies by educating ourselves on the tricks of data collectors. Navigating a world increasingly shaped by the information they gather and algorithms they deploy, we find that math can be a helpful and empowering tool. In effect, “we honor Robin Hood’s spirit by taking math from the rich and giving it to the rest of us.” Numbers matter, and Giansiracusa urges us to play the numbers game strategically. He shows us how some common statistical techniques work under the hood, and he demonstrates how to create your own ranking systems, use the weighted sum concept to personalize your own inflation rate, and understand your credit scores and even the S&P 500. Giansiracusa draws on wide-ranging examples from politics and history, including Nate Silver’s election predictions, the French Revolution, and World War II. We learn techniques for evaluating risk using math to clarify decision-making and how Bayesian formulas relate to how brains decide what to believe. The endnotes point to more stories primarily drawn from the popular press, and an index makes this a handy reference.

A math teacher turns out to be a lively and engaging storyteller we all need to hear.