No, that was one of the points where you correctly applied it, and I did say that you had both success and (IMO) failures in the usage of this tactic. My response was that the factor was already noted by the researchers. It is a blatantly obvious factor too. Instead, I was referencing to that thread on religion where you mis-applied the correlation-causation dilemma.
Also, I already explained why the arranged marriages are more successful, even with the cultural factors aside. The inverse of why cohabitation makes the marriages more unsuccessful. You can re-read that point if you wish, and pick up a sociology/psychology book, where this is a common example.
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