I recently finished reading the TED Book by Jim Hornthal, “A Haystack Full of Needles,” which included an overview of the different predictive approaches taken by one of the most common forms of data-driven decision making in the era of big data, namely, the recommendation engines increasingly provided by websites, social networks, and mobile apps.

These recommendation engines primarily employ one of three techniques, choosing to base their data-driven recommendations on the “wisdom” provided by either crowds, friends, or experts.

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