Dirty Data
“Dirty data — even seemingly minor inaccuracies like misspellings, typos, and missing information in database fields — can actually subtract value by throwing forecasts and calculations well off the mark. That's especially true when dirty data is duplicated or fed into further calculations, creating the "bullwhip effect," in which the amplitude of the error increases as you move further down the supply chain.”
Source: Jennifer Caplan. http://www.cfo.com/article/1,5309,9567,00.html
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