Yesterday, I published a post here examining the year-to-year correlations for a number of ball-in-play (BIP) pitching metrics. The results published there have some use on their own. As a practical application of that information, however, I’d like to take a look here at the nine potential free agent starting pitchers (besides Zack Greinke) whose teams faced a qualifying offer decision this offseason, and see how this analysis might impact their valuation.
Below, you’ll find two tables. The first, for reference, is a collection of all the year-to-year correlations from yesterday’s post. After that is a second table, featuring how each of the nine pitchers fared according to each metric. Comments regarding each pitchers in greater depth appear below that.
First, the correlation coefficients from yesterday’s post:
Correlation Coefficients, 2014-15 ERA Qualifiers
| K% |
0.81 |
| BB% |
0.66 |
| Pop% |
0.53 |
| Fly% |
0.76 |
| LD% |
0.14 |
| GB% |
0.86 |
| FL/LD |
0.37 |
| GB AUTH |
0.25 |
| BIP AUTH |
0.37 |
| ERA |
0.45 |
| FIP |
0.65 |
| TRU ERA |
0.72 |
Remember: a 100% correlation (1.00 in the above table) is obtained when the two sets of data are totally identical. The closer to 1.00, the higher degree of correlation between the two data sets.
Now what follows are the nine pitchers in question. Stats are presented as an index, where 100 is average, above 100 is above average, and below 100 is below average. Questions about the various metrics? A more thorough explanation can be found in yesterday’s post.
2014-15 QO Candidates – Key Stats Scaled to 100
*****
Brett Anderson (Profile)
Status: Accepted qualifying offer from Dodgers
Anderson’s key strength is his stratospheric grounder rate, the highest in the majors last year, over two standard deviations higher than league average. His walk rate was also a positive, over one half standard deviation lower than league average. Our correlation coefficients tell us that these are likely true talents, and should recur moving forward. Unfortunately, the same doesn’t apply to his low liner rate, which was over two standard deviations below league average. As much of a ground baller as Anderson is, repeating his 66.3% grounder rate would be quite a feat, and any reduction likely will translate point for point in an increase in liner rate.
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