Ted Williams: SLG v. righty/lefty pitchers.

baseball-fever.com has Ted Williams stats against lefty pitchers at this link.

I used that data here at my own link to figure stats for Williams against righty pitchers and to further enhance the data, including the creation of graphs.

Slugging average (SLG): Total bases / At Bats

Year  Pct Dif
1939 -7.53%
1940 -3.47%
1941 -22.68%
1942 -4.09%
1946 -44.25%
1947 -32.86%
1948 -3.89%
1949 -28.33%
1950 -33.97%
1951 -17.74%
1952 -100.00%
1953 -44.51%
1954 -43.28%
1955 -1.72%
1956 0.00%
1957 -27.22%
1958 -45.54%
1959 -21.98%
1960 -42.96%

The graph below shows Williams SLG percent difference against lefty pitchers: difference divided by SLG against righty pitchers.