|NL - MLB||.259||.331||.409||.299||8.97||18.37||7.68||2.49|
|IL - AAA||.262||.328||.395||.304||8.19||17.79||7.37||2.00|
|EL - AA||.258||.332||.385||.304||9.08||18.18||7.09||1.77|
|FSL - A+||.252||.322||.363||.303||8.24||19.01||6.31||1.41|
|SAL - A||.254||.324||.368||.314||7.91||20.67||6.60||1.42|
|NYP - SSA||.245||.320||.351||.304||8.66||20.42||6.22||1.10|
|APP - R||.257||.328||.384||.316||8.13||21.01||7.05||1.73|
The area where the trend is clearest, is in homerun rate. Take a look at the picture on the right. Each level, from rookie ball to the big leagues, hits home runs at a higher rate than the level beneath it, with one exception-the Appalachian League. The explanation for this is simple, older players inhabit the higher level leagues and older players are stronger and more experienced at picking pitches to drive.
A few other things that I think are interesting. Big leaguers strike out less than minor leaguers, despite facing the best pitchers in the world. The only hitters that struck out less than big-league hitters in 2009 were double-A Eastern league hitters, who are also the only ones to draw walks at a higher rate. Does this lend credence to the argument that AA is better preparation for the big leagues than AAA?