Alternative Data refers to non-traditional data sets that investors use to guide investment strategy, examples being credit card transactions, mobile device data, satellite imagery, social media sentiment, product reviews, weather data, web traffic, and app usage. The number of alternative-data providers is more than 20 times larger now than it was 30 years ago — with more than 400 currently active providers, compared to only 20 in 1990. A survey by the Alternative Investment Management Association...