WSJdpatton writes "Here's a data dilemma for companies: Are the customers and users they engage with representative of the population at large? That question is common online, where it's cheaper to find people but harder to ensure they represent Internet users as a whole — let alone all Americans. Two examples surfaced this week, writes Carl Bialik on The Numbers Guy. An Internet-monitoring firm's estimate of Google's first-quarter performance appeared to have been contradicted by Google's earnings report. Meanwhile, an Amazon unit, which provides popular but widely criticized measures of online traffic, updated its algorithm because the people it was tracking weren't typical of the Web at large." Link to Original Source
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