For these reasons, Furtado believed that linear estimators had more promise than was originally thought, and he set out to develop his own.
He unveiled the formula in the 1999 Big Bad Baseball Annual: "Extrapolated Runs was developed for use with seasons from 1955 to the present.
Unlike a lot of the other methods, you don't need to know team totals, actual runs, league figures or anything else.
Although I could have removed them from the full version, I felt that the inclusion of these terms was important since my research showed there was a strong correlation between the IBB, SF and GIDP opportunities that players face.
And unlike James' RC, it doesn't artificially inflate the runs produced by individual players who combine high OBPs and SLGs.