Illegal immigration has been a hot topic during election season, and new data from Harvard University, which shows undocumented men are much more likely to work than American men and for nearly anything, could add to the debate.

The Wall Street Journal staffer Jeffrey Sparshott takes a look at this research and how the challenges of analyzing America's 11.3 million immigrants affects policy makers (subscritpion required). Harvard professor George Borjas filled in gaps on policy assumptions. Borjas' newly developed statistical methods helped him arrive at three conclusions, one of which was:

The employment gap that distinguishes undocumented men from the other groups widened dramatically over the past twenty years. By 2014, the probability that an undocumented man was employed…was around 12 percentage points larger than that of native men.

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