outlier

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outlier

[′au̇t‚lī·ər]
(geology)
A group of rocks separated from the main mass and surrounded by outcrops of older rocks.
(statistics)
In a set of data, a value so far removed from other values in the distribution that its presence cannot be attributed to the random combination of chance causes.

outlier

An entity outside the norm. Pronounced "out-liar," an outlier may refer to a person, organization or to data way outside the normal range. See anomaly detection.
References in periodicals archive ?
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.
This aspect of the simulation study was included to represent the practice whereby a researcher would attempt to identify and then remove any outlying observations.
Still, big outlying observations exist; particularly noticeable are again those associated with the Great Depression and the Second World War.
Outlying observations were identified with box-plots, the distribution normality was verified by the Shapiro-Wilk test.
While there is a large cluster of countries close to the regression line, this is largely a consequence of the outlying observations discussed above.
In particular, extreme points, influential and outlying observations, which might represent erroneous data or otherwise reflect unusual market conditions such as non-arm's length transactions, can seriously undermine the performance of parametric estimator.