kelticwizard wrote:One thing that should be mentioned, to reinforce Nimh, is that state polls can be very volatile. [..] It's crazy, I know, but the smaller the group you study, the more the results swing back and forth quickly.
A state poll doesnt necessarily have fewer respondents than a national poll though. I mean, if its an actual state poll, rather than, say, the numbers from a certain state or group of states from within a national poll, but I dont think you ever see that. And if the state poll doesnt poll fewer people than a national poll, it should be just as stable or reliable, I didnt mean to imply otherwise. If there is a huge difference from a Michigan poll one day to a Michigan poll the next, it's probably because they were from different polling agencies with methodologies that worked out very differently. Just like the different national polls often differ greatly from each other.
What is always a problem though is working with subsamples. Say, a poll asks 700 or 1,000 respondents, from across the country or just from the one state. The write-up then specifies, "among Hispanics the numbers for Bush were even worse", or whatever. Then realise that said conclusion is based on the subsample of Hispanics among those 700 or 1,000, ie perhaps 100 people. Same if you isolate any given age group, or for example military families. Such subset-info can be very interesting, but considering the smaller numbers they're based on, are also quite relative and volatile. If they say, this poll shows Bush doing quite badly among elderly, blind Hispanic vets, dont take it all too seriously.