Outlier

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Outlier

A data point significantly different from others in the same set. An outlier is generally due to statistical noise and not to any fundamental difficulty with the data set. Taking the mean and median values of a data set can help reduce the influence of outliers. They are also called outlying observations.
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00] by method of estimation and percent of outlying observations, averaged across the other study variables.
This statistic is very sensitive to outlying observations tending to exaggerate the variance of prediction errors of model choices in which the prediction error is larger than the others (which is typical in land price studies).
The presence of extreme outlying observations with good reproducibility (Table 51 of the online Data Supplement) suggests that concomitant analyte interferentes may exist in the assay used by laboratory E2.
However, statistically influential outlying observations must be evaluated in terms of the research model.
The estimation of the regression function values for the ranges is an iterative process with minimization of the influence of the most outlying observations (Matlab, 2005).