for anyones that curious, this is the main data I'm considering and using when thinking about sliders... it may be more than anyone wants to know, but here it is anyway...
based on fan graphs (and some math on my part) here are some approximate MLB strike/swing/contact ratios for those interested
ok, breaking down the outcome of a pitch step by step, a pitch can either be in the strike zone or outside
Inside: 45%
Outside: 55%
Of those two outcomes, a pitch can either be swung at or taken (for a total of 4 outcomes)
If inside the zone...
Swing: 65% (or about 29% of all pitches)
Take: 35% (or about 16% of all pitches)
If outside the zone...
Swing: 29% (or about 16% of all pitches)
Take: 71% (or about 39% of all pitches)
This also means that 39% of all pitches end up balls, while 61% end up counting as strikes (either looking, or balls swung at). It also shows that 45% of all pitches get swung at, while 55% are taken (oddly enough, the exact same ratio as pitches inside the strike zone to outside)
Now, of the times you swing at a pitch (either inside or outside the strike zone), you can either make contact, or miss...
If inside the zone and swing...
Contact: 88% (or about 25.5% of all pitches)
Miss: 12% (or about 3.5% of all pitches)
If outside the zone and swing...
Contact: 67% (or about 10.7% of all pitches)
Miss: 33% (or about 5.3% of all pitches)
So when we look at the data as a whole, there are 6 possible results on every pitch...
Ball: 39%
Strike Looking: 16%
Swing and Contact on a pitch in the strike zone: 25.5%
Swing and Miss on a pitch in the strike zone: 3.5%
Swing and Contact on a pitch outside the strike zone: 10.7%
Swing an Miss on a pitch outside the strike zone: 5.3%
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