Pre-election polls in numerous countries this year have widely missed their marks, often by underestimating support for candidates on the ideological fringes. …
“The industry has a collective failure problem,” said John Curtice, the president of the British Polling Council and a professor of politics at the University of Strathclyde in Glasgow. Partly this is the result of changing methodologies. “It’s now a mix of random-digit dialing — that is, telephone polls — and Internet-based polls based on recruited panels,” he said. Both modes present potential problems. CONT.
Giovanni Russonello, New York Times