Vegas Seagull
New member
- Jul 10, 2009
- 7,782
Pollsters factor in historic data, it's part of the job. Ashcroft certainly does as he's explained his methods.
They don't all factor in previous votes for don't knows and those that do, do so in different ways.
They also account for no shows differently ie there are more Labour that say they are Labour but then admit they don't vote so could/should be discounted