- We weight according to sample size. There is little difference between a reasonable 1,000 person sample size or something larger, but because with a larger sample you can be more confident in viewing representative data in the cross-breaks, we weight them higher.
- Prolific pollsters are weighted down. Our tracker seeks to measure all pollsters. We weight down pollsters which publish more regularly than others to avoid one pollster saturating results.
- We weight by publication date. Newly published polls have a higher weighting in our tracker than older polls.
We do not yet weight according to a pollster’s record in previous elections.