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Two taps per pitch. Tap where the glove was set. Tap where the ball crossed the plate. That is the whole input. The distance between those two points is command, measured in feet, on every pitch you chart.

How far does he miss, and does he miss the same way twice? The Command tab gives a median miss in feet per pitch type, the share that finished within a foot, and how much those misses agree on a direction.

The report will not name a miss direction until it has earned the right to. Direction stays blank until the misses agree strongly enough to beat chance, because two pitches pointing the same way is a coincidence, not a pattern.