11 million illegal immigrants: How do we know?

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WASHINGTON—There’s one number that keeps popping up in the US debate over illegal immigration: 11 million.

That’s the estimate of how many people are living in the US without legal permission.

But how would anybody know? It’s not like people who are living in the United States illegally are jumping up and down to volunteer that kind of information.

Bring on the statisticians!

Number-crunchers dive deep into census data and other government surveys, make a bunch of educated assumptions and adjustments for people who may be left out, mix in some population information from Mexico and elsewhere and tend to arrive at similar figures.

The government’s Homeland Security Department, for example, estimates there were 11.5 million unauthorized immigrants living in the US in January 2011. The Pew Hispanic Center, a nonpartisan research organization, estimates there were 11.1 million living in the US in March 2011. Other estimates are in the same neighborhood.

The demographers rely on what’s called the “residual” method to tease out the data.

That is, they take estimates of the legal foreign-born population and subtract that number from the total foreign-born population. The remainder — or residual — represents those who are living in the country without legal permission.

It’s a fairly simple concept, but there are lots of complex assumptions that go into the calculations: How much to adjust for an undercount of foreign-born residents in the census that’s done once every 10 years? How many foreign-born residents are migrating out of the US? How many die in the US? And so on.

“All of these things tweak the numbers on the margins, but they don’t change the story very much,” says Randy Capps, a senior policy analyst at the nonpartisan Migration Policy Institute. “There’s a pretty good consensus, and I think the numbers are generally accepted on all sides of the debate.”

Pew demographer Jeffrey Passel, who’s been calculating illegal immigration estimates for decades, says the underlying method isn’t all that complicated, but there’s a lot of number-crunching to be done to reach a solid estimate.

“I wouldn’t argue that it’s good to the last hundred thousand, but I think most people think it’s within a half a million,” says Passel.

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  • http://profile.yahoo.com/NRLFHB4ZOMCNGDUJ2ZINRV7DAQ Juan

    To USA:

    Stop giving qualification exams to those who wanted to work inside the USA (NCLEX, CGFNS etc). You’re just milking those who wanted to do the right thing. 
    My brother spent a lot of money and spent a lot of time completing all your requirements he even resigned so he can focus on your exams but you never reimburst him when you impose retrogation. and he has to renew (cost a lot of money too) all his credential while waiting for nothing. STOP MILKING the RIGHT IMMIGRANT!

    • kanoy

       HUMMMM HOW MUCH DID THE RP REIMBURSE? THEY ASK,,,NO,,,,FORCE,,,,YOU TO GO TO THE USA,,,OR ELSEWHERE,,,BUT USA OR ELSEWHERE DON’T BEG YOU TO ENTER,,,THERE IS NO GUARANTEE IN LIFE,,,BUT ONE,,,,,YOU WILL DIE….OTHER THAN THAT…LIFE IS A CRAP SHOOT,,,,SOMETIMES IT COMES UP SNAKE EYES,,,YOU PAY FOR COLLAGE TOO BUT ARE NOT GUARANTEED TO GRADUATE NOR A DIPLOMA AND NO REIMBURSEMENTS FOR THOSE THAT DON’T

  • riza888

    To all US and legal citizens, pay your taxes. Eleven million illegal immigrants depend on you!
    Want to see tax money in action come to the US health clinics in the town…..
    80% of the people are illegal. Whose paying for that?
    How about the schools unfunded mandates to educate illegal kids in US schools?
    Whose paying for that?

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