How often are our numbers wrong?

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Located 21 studies that permitted an estimate of the frequency of recording errors and/or the degree to which errors were nonrandom. The studies, summarizing data from over 300 observers making about 140,000 observations, suggest that about 1% of all observations may be in error and that about two thirds of all errors favor the hypothesis of the observer. (19 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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