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Numbersense: How to Use Big Data to Your Advantage by Kaiser Fung

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How Much Did You Pay for the Eggs?

Recall when you last shopped for groceries. Do you remember what you purchased, and how much you paid for each item in your shopping cart? If you bought a carton of milk or juice, do you know if the price you paid was over or under the average? When you answered the previous question, what did you mean by the average? Was it the normal price at the specific store, or the median price among several stores in your neighborhood, or something else? Do you remember if the milk was one of the store’s weekly specials? Do you remember if you redeemed a clipped coupon? Do you remember if you picked up a new brand of juice ...

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