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Another source came from email analytics companies that had access to the emails—and thus receipts—of millions of consumers, and could offer market share metrics down to specific geographies and trip types.

Price is the maximally compressed signal of economically relevant information.

Hypotheses typically estimate a given distribution parameter such as the mean or median. This is then used to build a histogram

to make inferences about populations, you need statistical methods that incorporate estimates of sampling error.

Easily pulls accurate data from any source