"So according to Gallup, if you polled 48-47 before and 48-40 after, that means there has been no bounce, or if you polled 47-42 afterwards, you got a -1 bounce.
Does that make sense to you?'
Actually, it does.
Consider that the 'bounce' in candidates pols would have to show an 'increase' in his. Not a decrease in his opponents.
If you use the 48-47 and 48-40 figures, it just shows that some that were in the 'Kerry' column are not questioning their decision.
"If you use the 48-47 and 48-40 figures, it just shows that some that were in the 'Kerry' column are not questioning their decision. "
Sorry,.
Should have read 'are NOW questioning their decision.'
The ultimate goal is have more people vote for you than your opponent.
Decreasing the number of people who votes for your opponent is as good a means to achieve that objective as getting more people to vote for you. Therefore any analysis of polling should take both strategies into account, not just the latter.