Pelletier (PBUH) claims that doubles in Strat are worth slightly less than in MLB. viewtopic.php?f=17&t=639204 I've never studied the issue systematically but I have no reason to doubt him given how accurate the rest of his data has proven to be.
I've tried to run some simulations and doubles and triples always come out lower in value than the standard values. I always attributed it to the crudeness of the simulation (not accounting for sacrifice flies, etc.).
I didn't realize that Marc also found the same thing.
There’s another way to explain the difference. There are essentially three types of negative impacts of making an out:
1. Removing a runner who is on base, which occurs during a caught stealing or double play.
2. Decreasing the value of a runner on base, because he now has fewer outs in which to score during the rest of the inning.
3. Reducing the potential number of runs a team can score in a game, by reducing the number of outs left in the game.
In the wOBA article, they refer to the "ticking clock" negative aspect of an out which is related to the value of the extra plate appearance that you lose at the end of the game. This is #3.
But the ticking clock also plays into each individual inning whether there are runners on or not. Yes, it decreases the value of any runners (#2). But it also decreases the run expectancy of the inning even if there are no runners on base.
Where is that factored in?