I've never said that polling Twitter is going to be a total replacement for traditional polling far from it but I do think it could be a useful addition is certain circumstances. So I was interested to see how yesterdays Twitter poll compared with the Yougov poll on the London Mayoral election that came out yesterday. I tested the correlation between the two and it came back at 89% quite a bit higher than I was expecting.
> a [1] 45 40 7 2 2 1 3 > b [1] 875 544 235 203 348 52 0 > cor(a,b) [1] 0.8948858
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