Ted Williams: lefty batter v. lefty pitcher - percent of PA.

In a recent post I restricted my analysis of lefty batters to seasons 1950 through 2012 because play-by-play data is scarce before 1950.  A friend sent me this link about research done on Ted Williams:

http://www.baseball-fever.com/showthread.php?16742-Ted-Williams-vs-Left-handed-Pitchers/page18&s=87e5efa91887134e9acb97ad6590a438

It has details on basic stats per season for Williams against lefty pitchers, although oddly not also against righty pitchers.  Obviously, we could figure that out by subtracting from Williams totals.

I noticed a couple of things.

1. The researcher relies on OPS, not OPS+, thus enhancing Williams stats due to Williams playing his home games in a good hitting park.  OPS Home 1.148, Road 1.082.  tOPS+ Home 106, Road 94.

2. Williams seemed to have a very low percentage of plate appearances (PA) against lefty pitchers: 21%.

The researcher concludes that Williams hit very well against lefty pitchers.

BA OBP SLG OPS
.311 .436 .493 0.929 v. lefty pitchers
.323 .447 .513 0.960 v. lefty pitchers before 1958
.344 .482 .634 1.115 career

baseball-reference.com had a .298 batting average for Williams against lefty pitchers for 1950-1960.

Percent PA by lefty batters against lefty pitchers:

Snider 14.20%
Williams 20.87%
Mathews 22.36%
McCovey 24.23%
Yaztremski 24.41%
Helton 28.91%
Boggs 29.05%
Carew 31.41%
Bonds 32.90%
Brett 33.27%
Gwynn 37.93%

Williams home run (HR) rates (higher is better):

Williams HR/AB HR AB
home  .0638 248 3,887
road  .0715 273 3,819

LHP  .0384 64 1,666
RHP  .0757 457 6,040

total  .0676 521 7,706