[QUOTE=Jinx]
Can a baseball fan tell me what this statistic really means, if stated by itself? For example, consider The Visitors score 6 runs 9 hits 1 error and strand 3 men whereas the Home Team scores 9 runs 14 hits and 1 error and strand 9 men.
While I realize stranding men is bad, in general, especially if they were in scoring position. But, if I only said the home team stranded 9 men without the score, you’d say that’s terrible. But, is it so bad? I mean, the Home Team did win, right?
Is there some other way this stat can be interpreted to have more meaning? Perhaps a running team average (men left on / total men on base) maintained through the season? - Jinx 
[/QUOTE]
Over the course of the season, the teams that leave the most men on base will score the most runs and win the most games. It’s simply obvious that teams that hit better will always leave more men on base, since they’re putting more men on base. The innings have to end sometime, and you’re not going to hit a home run at the end of every inning.
Within a single game it can tell you if a team had a frustrating day, e.g. if they scored one run and left eleven men on, which certainly does suck, but those games tend to balance out with the games where you scored eight and left one man on.
Teams (at least at the pro level) simply don’t vary all that much in terms of how well they hit with runners in scoring position and whatnot. If they get a lot of guys on base they score a lot of runs, and if they don’t, they don’t. The only other important factor is how many home runs they hit. Stuff like how many bases you steal or sacrifice bunts you make and stuff has no significant impact at all.
Regrettably, I cannot find anywhere that lists 2005 runners left on base for major league teams, but I’ll keep looking.