by ugrant » Tue Sep 08, 2009 10:58 pm
Marcus - it's not about memory or behaviour modification. It's about odds (or probabilities, pick your term).
Each column has 1/6 of a chance of being rolled, meaning that there is also a 5/6 chance that the same column will not be rolled. If I leave it right there, everyone would be happy and the folks slinging mud at me would yell, "hallejulah, you get it, it didn't take 5 years."
But my follow-on argument is about same column repetition, where the chance to replicate a same column roll is 1/6 (same as rolling any other column, yes, I get that). But the chance to not replicate that column is 5/6 or 83.3% vs the 16.7% to replicate the column.
So during the follow-on roll, the manager who has his desired column on the same number as the last roll has a 16.7% chance of achieving that roll and a 83.3% chance of not achieving that roll. That will not change, he gets his column or he doesn't (and the odds favor he won't).
The manager who varies his column as to not duplicate the previous roll has a 16.7% of missing outright (the roll duplicates) or a 83.3% chance that the roll does not duplicate. Here's where it gets murky and folks start making up ways to call me an idiot: since the roll did not duplicate there are now five columns left that it can roll and the manager that did not duplicate his columns has a 1/5 chance of being correct, or 20%.
That's an 83.3% chance of increasing the odds to 20% of getting the desired column. Voorhits correctly analyzed that 20% of 83.3% is 16.7%, same odds as 1/6, but that's the odds at the start of the roll. If the roll does not duplicate the previous column, the 83.3% is achieved and the odds are 20% for the manager who varied his columns (while the manager who has duplicate columns has already moved on, his 16.7% missed).