Wednesday, February 3, 2010

The grisly truth about the Super Bowl abortion ad

At Slate, great comments from William Saletan on the Tebow abortion ad, and the role of survivor bias:

Pam's story certainly is moving. But as a guide to making abortion decisions, it's misleading. Doctors are right to worry about continuing pregnancies like hers. Placental abruption has killed thousands of women and fetuses. No doubt some of these women trusted in God and said no to abortion, as she did. But they didn't end up with Heisman-winning sons. They ended up dead.
Being dead is just the first problem with dying in pregnancy. Another problem is that the fetus you were trying to save dies with you. A third problem is that your existing kids lose their mother. A fourth problem is that if you had aborted the pregnancy, you might have gotten pregnant again and brought a new baby into the world, but now you can't. And now the Tebows have exposed a fifth problem: You can't make a TV ad.
On Sunday, we won't see all the women who chose life and found death. We'll just see the Tebows, because they're alive and happy to talk about it. In the business world, this is known as survivor bias: Failed mutual funds disappear, leaving behind the successful ones, which creates the illusion that mutual funds tend to beat market averages. In the Tebows' case, the survivor bias is literal. If you're diagnosed with placental abruption, you have the right to choose life. But don't be so sure that life is what you'll get.

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