Originally Posted by kaldaniels
So lets assume that 25% of Chapman's 98+ taken strikes are balls.
Is it too much to ask to see some photographic prove?
Lets take it a step further. If you are a fireballer getting jerked around why not make a huge stink in the press? 25 percent error rate is beyond comprehension.
It is possible to do if you wanted to spend the money for MLB.tv (for archived game footage) and wanted to cross check PFX data. The problem is, you are talking about thousands and thousands of pitches here. That isn't something many people are going to be able to undertake in terms of going back and loading up the video, capturing it, editing it and comparing it against pitcher XYZ and his slower fastball. That doesn't even come into play with the fact that camera angles in every ballpark are different, so you aren't going to be able to do much with the video unless you are solely looking at it in one ballpark.
But it is pretty simple, if you accept that the Pitch F/X system is incredibly accurate (and MLB, MLB Teams and every television station that covers the games all do), then what the author is saying is true.