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"He uses statistics like a drunk man uses a lamppost; more for support than illumination"
Multiple regression analysis is a really useful technique. It allows us to model the simultaneous impact of several variables on an outcome of interest.
But in the 1980s, multiple regression analysis developed something of a bad name.
The advent of modern computing meant that it became widely available and open to much abuse during the 1970s. It's unthinking use as a 'Hail Mary' method to pull something interesting from a motley collection of variables led to an entire literature based upon utter nonsense. Rather than think about the data, developing and then testing hypotheses about the science, it became the weapon of first choice for the data fisher. The thinking, if any, ran along the lines:
Not surprisingly, what popped out was often a bunch of random nonsense. Anyone with half a brain needed just five minutes to see it was clearly nonsense. But the abuser had the 'statistical' support they needed.