Defensive Efficiency Ratio (DER)
BTW: I suggest reading that book! Defensive Efficiency Ratio is a statistic used to evaluate team defense by finding out the rate of times batters reach base, on balls put in play. Basically, for every ball hit into the field of play, how likely is the defense to convert that into an out? The formula for Defensive Efficiency Ratio is: 1 – ((H + ROE – HR) / (PA –…