In the frenzy of all the attention regarding the National Marriage Project report, co-authored by Galena Rhoades and me, and recently released, we wrote a conceptual piece posted at The Institute for Family Studies on issues that arise in how researchers think about causality and personal choice, and how statistical approaches intersect with what researchers do and what they conclude.
It's somewhat more technical than most things I post, but the piece is more conceptual than statistical if you are interested in the subject.
Which Door? Thoughts on The Consequential Choices of Researchers and Other Humans