Checking How Fact-checkers Check — I evaluate the performance of two major online fact-checkers, Politfact at Tampa Bay Times and Fact Checker at Washington Post, comparing their interrater reliability using a method that is regularly utilized across the social sciences. I show that fact-checkers rarely fact-check the same statement, and when they do, there is little agreement in their ratings. Approximately, 1 in 10 statements is fact-checked by both fact-checking outlets, and among claims that both outlets check, their factual ratings have a Cohen’s κ of 0.52, an agreement rate much lower than what is acceptable for social scientific coding. The results suggest that difficulties in fact-checking elites’ statements may limit the ability of journalistic fact-checking to hold politicians accountable. (via Marginal Revolution)
JSON Feed — another tilt at the content syndication windmill. “It’s Atom but in convenient COBOL Object Notation,” he said twitching. “Both remaining bloggers have signed up to use it!”
Street-Fighting Mathematics (PDF) — MIT book on the art of educated guessing and opportunistic problem-solving. The major sections are: Dimensions; Easy cases; Lumping; Pictorial proofs; Taking out the big part; Analogy.