Gimme a break. This seems like an obvious ploy for a discrimination lawsuit or just another "study" by race advocates looking to score some points in the media. As someone already pointed out, there are absolutely no hard numbers supporting the finding of supposed discrimination. If the difference is miniscule or within the margin of error, the "study" is worthless on its face.
In addition, this "study" apparently did not take into account the race of the BATTER the pitcher was facing at the time of the call. This is a fatal flaw. What "bias" is there for a white ump to call a strike thrown by white pitcher to a white batter, or a ball from a "minority" pitcher to a minority player? In either case, the results of the "study" will reflect an increased bias on the call, but in reality there's no bias because the ump's fellow "white" hitter will be penalized (by the strike) and the minority hitter will benefit from the call being a ball. Without knowing which race the hitter was from, the "study" in meaningless.
The study also assumes that all pitchers are exactly the same in their approach to pitching. But it seems to be there are more older white "control" pitchers and more younger latin "power" pitchers right now, which would skew the results in favor of more called strikes by white pitchers without any bias at all.
What does the study define as a "minority" pitcher? In some cases, a pitcher is clearly white (Randy Johnson) or clearly a minority (Dontrelle), but what about guys like Andy Pettitte (who I believe is part Native American)? If Derek Jeter was a pitcher, what race would he be considered? Johnny Damon (he's half Thai)?
Also consider this doozy of a statement: "But, this behavior diminishes when the umpire's calls are more closely scrutinized—for example at ballparks with electronic monitoring systems, in full count situation where there are 3 balls or 2 strikes, or at well-attended games." Are they serious? These biased white umps actually consider how many people are attending the game before they indulge their racism? What about the tens of millions watching on TV? Do they count? This is too silly to take seriously.
I am the Master. Don't question the Master. Just do what he says and be proud.