I often tell people to watch out for selection bias. Immigrants are a distinctly unique people. They're not just members of their foreign racial/national group, they're members of their foreign racial/national group with the ambitions/motivations to leave. To make the abstract concrete. Canadians living in the US are often thought to be "just like" Canadians living in Canada. But they're often not. Often they're the…
There's also significant selection bias on the entry side. U.S. immigration policies are heavily biased towards people with unique skills, high levels of education, and a fair amount of money in their home country, and biased against people who are likely to be a drain on public assistance. That means that most hyphenated-Americans have already passed two significant high-pass filters: they have to be willing to upro…
It's a different kind of high-pass filter (not meaning necessarily that's easier).