On base percentage

Reached on error counts against you for OB%

OBP (On Base Percentage)
A measure of how often a batter gets to first base (or beyond) for any reason other than a fielding error or a fielder's choice. The official formula used by MLB is:
OBP = (H + BB + HBP) / (AB + BB + HBP + SF)

I use: Sons of Sam Horn Stats

Which defines more stats than you'll ever want defined.

Thanks, guys. I'n no mathmetician, but trying to understand this, it's basically hits+walks+HBP divided by total number of plate apperances (not offical at bats but times up). Just trying to understand the equation and not just plug in numbers blindly.
Great website, JMoff. That will help me tremendously, as well as confuse the hell out of me at times!

It's plate appearances minus sacrifice bunts, minus any reached on catcher's interference. Probably one or two others I'm not thinking of as well...

Plate appearances is probably close enough. I know what you mean about confused.

Why SF counts against you and SAC doesn't? Probably because they figure a bunt is on purpose and a fly out that scores a run is just 'luck'? Don't know.

Thanks again, JMoff. I saw that disussion on another thread in this forum. Very interesting. And to think I naively thought on base percentage would be how many times you got on base, regardless how, divided by plate appearances!