The debate about correlation between abortion and crimes continues. This time, in the Wall Street Journal:
The "Freakonomics" chapter on abortion grew out of statistical studies Mr. Levitt and a co-author, Yale Law School Prof. John Donohue, conducted on the subject. The theory: Unwanted children are more likely to become troubled adolescents, prone to crime and drug use, than are wanted children. When abortion was legalized in the 1970s, a whole generation of unwanted births were averted, leading to a drop in crime nearly two decades later when this phantom generation would have come of age.
The Boston Fed's Mr. Foote says he spotted a missing formula in the programming of Mr. Levitt's original research. He argues the programming oversight made it difficult to pick up other factors that might have influenced crime rates during the 1980s and 1990s, like the crack wave that waxed and waned during that period. He also argues that in producing the research, Mr. Levitt should have counted arrests on a per-capita basis. Instead, he counted overall arrests. After he adjusted for both factors, Mr. Foote says, the abortion effect disappeared.
"There are no statistical grounds for believing that the hypothetical youths who were aborted as fetuses would have been more likely to commit crimes had they reached maturity than the actual youths who developed from fetuses and carried to term," the authors assert in the report. . . .
Mr. Levitt counters that Mr. Foote is looking only at a narrow subset of his overall work on abortion and crime, so his results are of limited value, and not grounds for dismissing the whole theory. He acknowledges the programming error, but says taken by itself, that error doesn't put much of a dent in his work. (Mr. Foote's result depends on changing that formula and on the adjustment for per-capita arrests.) Moreover, Mr. Levitt says the abortion theory has held up when examined in other countries, like Canada and Australia, and when applied to other subjects, like drug use. . . .
Edward Glaeser, a Harvard professor who helped referee Mr. Levitt's original abortion submission to the Quarterly Journal of Economics, said the Foote critique isn't damning, though it does suggest the impact of abortion on crime has not been as strong as Mr. Levitt has argued. "These guys have put the [data] through the wringer," Mr. Glaeser says of Mr. Foote and his research assistant. "There is no question that the results get smaller and weaker, but there still seems to be something there."
