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# Measure Fielding with Linear Weights

Use fielding runs to measure a player’s defensive performance with the linear weights system.

Fielding runs (FR) is a formula for measuring a defense’s contribution compared to an average defense. FR is the fielding part of the linear weights system for measuring player contributions. It measures the number of runs that a defense prevented from scoring compared to the league average fielder.

## The Formula

Computing FR is a little bit more complicated than computing some other formulas in this chapter. First, I will explain how the system works. Then, I’ll explain how to compute fielding runs in four steps.

Comparisons to league average for position

For each measurement (A, PO, DP, E, PB), we compare the total fielded by each player to the league average. We call the league averages the expected numbers.