Bofferbrauer2 said:
Great, gives a very good overview, not just for the national polls, but also the state polls and whom endorsed whom. I just don't understand how their pollster ratings work. And I wouldn't have expected nearly as many pollsters... |
538 has an old article with explanations of it's methodology which is still linked from the pollster rating. Therefore this methodology is still true for the most part.
Short version: basically it takes old polls from that firm close to the elections and compares it to the result of the election. The calculated difference is then compared with the differences of other pollsters for the same race or (if only few firms polled that race) with similar races. A pollster who often did better than the competition gets a good grade.
