I've been looking at the run values of different pitch locations for the last couple of weeks and today I wanted to examine the frequency that pitches are thrown to a particular location. The frequency a pitch is thrown plays a huge part in it's effectiveness, and I believe the frequency it is thrown to a certain location is a further refinement on looking at just regular frequency. I found some interesting regarding the success against fastballs in certain areas last week and thought that maybe looking at the frequency could help clarify some of those findings.
In order to examine the locational frequencies I created density plots that show how often a pitch is thrown in a certain area. The dots on the plot are individual pitches and are colored based on the local frequency. The color scale follows the standard convention of a density plot, with "hotter" colors representing areas where events are more frequent. Another thing to keep in mind when looking at these graphs is that the scales are relative for each situation. This isn't ideal, because you can't easily compare frequencies across situations, but it works fine for each situational graph individually.
Starting in an 0&0 count, lets see how pitchers start right-handed hitters off. The four graphs below show the frequency that fastballs, changeups, sliders and curveballs are thrown in that situation.
Again, you can't directly compare the scales from graph to graph, but you can get a good idea of where the different types of pitches are thrown. One thing that was somewhat interesting, especially after looking at these graphs, was the frequency that pitchers worked inside to RHH. 0&0 is a neutral count, so the pitcher has some choice with where he throws a pitch, but whats interesting is how the locations for different pitches in an 0&0 count compare to the locations for the same pitches in an 0&2 count.
This is pretty neat. The locations are pretty much what we would expect, with more pitches being thrown out of the zone and at the corners than before. You can see that pitchers do go up in the zone with 0&2 fastballs and that 0&2 breaking balls are thrown down and out of the zone.
There is a ton more to learn from these graphs and similar pictures, however, I'm not going to be the person who does the majority of that discovering, at least not online. I've taken an internship with an MLB team and this is my last article for Baseball Analysts.
Sure the pay is low and the hours are long, but for a 23 year old baseball fiend, there's no cooler feeling than going to work at the ballpark everyday. Working in professional baseball is what I want to do. I'm deeply indebted to Rich for giving me the opportunity and space to write these articles on the pitch f/x system and I'm also in debt to the readers who forced me to be at (or near) the top of my game when I was writing articles. Writing for for Baseball Analysts has been a fantastic experience and I'm going to miss it, but I'm moving on and couldn't be happier with what the future holds. To quote The Boss, "good luck goodbye" (and thanks).