Study conducted immediately after vote indicates that sampling in earlier polls may not fill been random enoughNew research into May’s general election sheds light on what went wrong with the opinion polls,which notoriously all failed to predict David Cameron’s outright win.
The face-to-face survey of nearly 3000 adults in 300 constituencies was conducted soon after polling day as piece of the British Election Study (BES), and it accurately gauged the Conservative advantage over Labour at about seven percentage points. That is in marked contrast to the final pre-election polls, and which predicted a dead heat.
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Source: theguardian.com