In this paper, Professor Michael New provides a more extended version, with hyperlinked data, of his NRO essay (which I highlighted yesterday) exposing the flaws in a study on abortion touted by self-described pro-life supporters of Barack Obama. From his conclusion:
Overall, it seems that Catholics in Alliance was primarily interested in making the case that welfare spending was the best way to reduce abortion. They even refused to properly acknowledge and publicize their own findings which indicated that certain types of pro-life laws were effective.
My analysis of their data indicates that welfare spending only has a marginal impact on the incidence of abortion. Additionally I find that both public funding restrictions and informed-consent laws are effective at reducing state abortion rates. This adds to the body of research which finds that pro-life laws are effective.