Outlier

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Related to Extreme outlier: Mild outlier

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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Random Variance

References in periodicals archive ?

Humber Summit highlighted in red for the "Local Employment" indicator boxplot (before extreme outlier removal)

Making area-based composite indices comparable across time--the role of standardization and outlier removal

The virus A/duck/Vietnam/NCVD-664/2010 that carried the H275Y mutation was predictably identified as an extreme outlier for peramivir with a 415-fold increase in [IC.

Antiviral susceptibility of highly pathogenic avian influenza A(H5N1) viruses isolated from poultry, Vietnam, 2009-2011

All failed grades for PC and PS assays were extreme outliers, which was similar to the AT assay and suggested accurate grading.

External quality assurance of antithrombin, protein C, and protein S assays: results of the college of American pathologists proficiency testing program in thrombophilia

As the MS is the third filter, it is not likely to be affected by extreme outliers.

Market and financial performance as related to idiosyncratic risk and the effect of outlier screening in market studies

It should also be noted that often in practice, a dataset becomes skewed due to the presence of a few extreme outliers and /or mixture samples with varying degree of contamination.

Spatial population partitioning using Voronoi diagrams for environmental data analysis

Inspection of the data suggested that while some extreme outliers could be attributed to genuine extremely local rainfall events, many were recording errors.

Correlations between precipitation patterns in Southern Mexico and the El Nino sea surface temperature index/ Patrones de precipitacion en el sureste de Mexico y su correlacion con el indice de temperatura superficial marina de la corriente El Nino/ Correlacao entre os dados de precipitacao no sul de Mexico e o indice de temperatura na superficie marinha durante o fenomeno "El Nino"

5-3 box lengths from the upper or lower edge of the box and the *'s denote values that are extreme outliers (more than three box lengths).

Exploring patterns of remission from alcohol dependence with and without Alcoholics Anonymous in a population sample

Chile and the Philippines had been much more democratic than "expected" on the basis of their relatively low level of socio-economic development, while Spain, Portugal and Saudi Arabia were the most extreme outliers in the opposite direction.

AUTHORITARIAN AND DEMOCRATIC TRANSITIONS IN NATIONAL POLITICAL SYSTEMS

Although the present experiment focused on the assessment of correlation in displays purposefully constructed to be free of major violations of homoscedasticity, such as those caused by large groupings of extreme outliers, our informal observations of auditory scatterplots involving gross departures from bivariate normality suggest that the ears detect such features well.

Cross-modal equivalence of visual and auditory scatterplots for exploring bivariate data samples

Extreme outliers were dampened by making a rate four times that of natural fertility (44.

'The number and quality of children': education and marital fertility in early-twentieth century Iowa

Another model, containing counts of billed CRVS procedure codes from medical and surgical providers rather than counts of procedural visits, slightly reduced the number of extreme outliers but did not improve the overall [R.

Estimating annual charges for ambulatory care from limited utilization data

While a lower P/S ratio is generally thought to be better than a higher P/S ratio, the cut off at 3 helps exclude extreme outliers while at the same time giving enough room to ride the momentum of the stocks being found.

Zacks.com Featured Expert Kevin Matras Highlights: Knoll, Kendle International and Atlantic Tele-Network