PBR - The graph below shows the raw figures for each club in each of the three categories. To compare the clubs (within the National League) I calculated how many standard deviations each club was from the average in the three categories. I then added the three standard deviations together for the Total Stan. D (which you see below). 

Using regression coefficients from  earlier research, I placed the individual standard deviations into the following formula: (0.4999+(0.0052*OPS s.d.)+(0.0724* RDiff s.d.)+(0.0061*WHIP s.d.)). This formula produces the Estimated Winning Percentage you see below. You can then compare the Estimated Winning Percentage to the Actual Winning Percentage and determine how much luck - good or bad - has impacted a particular team.

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