One version of an adage attributed by some to Yogi Berra is that the difference between theory and practice is greater in practice than in theory. One arena where the existence of such a difference is intuitively plausible is when researchers ask questions of a sample of humans in the general population. Despite extensive prior work in many disciplines, not only on survey design but also on adjusting for the relatively high contemporary rates of nonresponse, Heffetz and Rabin have succeeded in identifying a new and intriguing source of potential bias that affects whether inferences drawn from the sample can be applied more widely.
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