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That's not true, there have been countless articles about why polling went wrong last time.

Also, polling wasn't that wrong. Due to sampling bias, several swing states were off by as much as 5-6 percentage points. But national polling bad Hillary winning by something like 4% in the popular vote.

Instead, she won the popular vote by 3%.



> several swing states were off by as much as 5-6 percentage points

Most state polls have margins of error ranging from 3 to 6 points. A 3-point MoE state poll is a really expensive poll.


A properly conducted poll with 1000 respondents has a margin of error of 3.2%. There have been quite a few of these in battleground states this cycle.




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