Most of the bounces in Trump’s approval ratings aren’t real

Donald Trump’s approval rating is one of the key news stories of 2017. That’s true not just for political junkies. Approval — or the lack of it — can give the president more or less power as he negotiates with Congress.

How do we know a president’s approval rating? From polls. But how the poll data are processed makes a difference in what the results are. CONT.

Andrew Gelman (Columbia), The Monkey Cage