A reader asked about the incidence of doubles of triples, broken down by whether the batters hit lefty or right.
Looking at 2007, that info is available on the ML Batting Splits page.
In 99448 AB, right-handed batters hit 5458 doubles and 426 triples.
In 68335 AB, left-handed batters hit 3739 doubles and 512 triples.
Right away, you can see that LHB hit triples at a much higher rate, given that they hit more triples in fewer at-bats. Normalizing by number of at-bats, here's the comparison:
For doubles, RHB hit 1 per 18.22 at-bats, where as LHB hit 1 per 18.28 at-bats. For all intents are purposes, that's absolutely identical. If there were a team of all lefties versus a team of all righties, the team of lefties would hit about 1 more double over the course of an entire season.
For triples, it's a different story. RHB hit 1 per 233.4 AB, whereas LHB hit 1 per 133.5 AB. That's a huge difference. Again comparing mythical teams of all lefties vs all righties, the lefty team would hit about 20 more triples per year.
Interestingly, RHB and LHB had virtually identical batting averages, with RHB hitting .2677 for the year and LHB hitting .2685 for the year. Looking just at singles, RHB hit 17,783 in 99,448 ABs and LHB hit 12,102 in 68,335 ABs. That 1 single per 5.59 ABs for righties, and 1 single per 5.65 ABs for lefties. That'd be a difference of just 11 singles over a year for a team of righties over a team of lefties.
For homers, righties has 2956, or 1 per 33.6 ABs. Lefties managed 2001, or 1 per 34.2 ABs. Over the course of a season, a team of righties would hit 3 more homers in a season as compared to a team of lefties.
So, lefties hit more singles and triples, whereas righties hit more doubles and homers. However, it's only the difference in triples that's very significant.