Minors to the Majors: Adding Plate Discipline to Hit Grade
I have been breaking down the prospect Hit grade over the past few weeks. Now it’s time to find what’s usable for projections. One aspect I continue to find is that a plate discipline component seems to not be incorporated into the Hit grades. For this reason, I created a minor league Plate Discipline grade and used it with existing data to hopefully better map out a hitter’s future potential.
To start with, I used Walk Rate (BB%-IBB%) minus Strikeout Rate (K%) as a measure of minor league plate discipline. I grouped the values by the low minors (any A ball) or the upper minors (AA and AAA). Then, I gave the players a 50 grade for each level’s average plate discipline and a 60 for one standard deviation from the median. Here are the results:
| Grade | Lower Miners | High Minors |
|---|---|---|
| 80 | 26.9% | 25.3% |
| 75 | 20.6% | 19.4% |
| 70 | 14.2% | 13.5% |
| 65 | 7.8% | 7.7% |
| 60 | 1.5% | 1.8% |
| 55 | -4.9% | -4.0% |
| 50 | -11.3% | -9.9% |
| 45 | -17.7% | -15.7% |
| 40 | -24.0% | -21.6% |
| 35 | -30.4% | -27.4% |
| 30 | -36.8% | -33.3% |
| 25 | -43.1% | -39.1% |
| 20 | -49.5% | -45.0% |
