How a 9 point lead became a 7 percent one
Shouldn’t poll numbers be based on responses alone? It might come as a surprise to many that the headline figures from the three main past vote weighting phone pollsters, ICM/Populus/ComRes, are not based solely on how interviewees said they would vote. For before finalising their voting intention figures each of them makes an adjustment based on what they think the quite significant numbers of “refused”/”“won’t say” respondees would have done if they had stated an intention. This can cause the…