1. If they cut people who married and divorced out of the "married" group, did they then include them in the "single" group? That too could result in bias.

2. If they've taken other research into happiness into account. There are studies, dating back to the 70's, that show that long-term happiness tends to be stable over time, regardless of external events. I believe the example I heard was that, one year after the event, both amputees and lottery winners found their happiness back down at the level previous to the event.

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