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Observer drift is when two people who are observing something start agreeing with each other more and more often. For instance, if two teachers are rating final projects, and one of them rates more strictly than the other and they both know that, then the strict one might start thinking that he or she is too strict and the easy one might think he or she is not strict enough, and so they will change the way they rate things to be more similar. In teaching, sometimes this is a good thing, because you get more consistent grades, but in psychology, where a lot depends on the observer being unbiased, it is usually a bad thing because it tends to sway the results one way or another and corrupt the results of an experiment.

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18y ago

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