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influential observation
In statistics, an influential observation is an observation for a statistical calculation whose deletion from the dataset would noticeably change the result of the calculation.〔.〕 In particular, in regression analysis an influential point is one whose deletion has a large effect on the parameter estimates.
== Example ==
In Anscombe's Quartet the two datasets on the bottom both contain influential points. If one point were removed, the line would look very different.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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