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Observational error
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== Propagation of errors == {{main|Propagation of uncertainty}} When two or more observations or two or more instruments are combined, the errors in each combine. Estimates of the error in the result of such combinations depend upon the statistical characteristics of each individual measurement and on the possible statistical correlation between them.<ref>{{Cite book |last=Young |first=Hugh D. |title=Statistical treatment of experimental data: an introduction to statistical methods |date=1996 |publisher=Waveland Press |isbn=978-0-88133-913-0 |edition=Repr |location=Long Grove, Ill |url=https://archive.org/details/H_D_Young__Statistical_Treatment_of_Experimental_Data/page/n53/mode/2up}}</ref>{{rp|92}}
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