Extrapolated Runs (XR) is a baseball statistic invented by sabermetrician Jim Furtado to estimate the number of runs a hitter contributes to his team. XR measures essentially the same thing as Bill James' Runs Created, but it is a linear weights formula that assigns a run value to each event, rather than a multiplicative formula like James' creation.
Read more about Extrapolated Runs: Purpose and Formulae, Pros and Cons of Extrapolated Runs
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“A cruel story runs on wheels, and every hand oils the wheels as they run.”
—Ouida [Marie Louise De La Ramée] (1839–1908)