An introduction to our full investigation into what went wrong with YouGov’s 2015 general election polling

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The introduction notes: "Our final poll had Labour and the Conservatives tied at 34% when in fact the Conservatives won with 37.7% of the vote, well ahead of Labour at 31.2% of the vote. This 3.7% understatement of the Conservative vote and 2.8% overstatement of the Labour vote makes an average error of 3.35% (which translates into a 6.7% error in estimating the lead). The other parties were essentially correct."

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