TY - JOUR
T1 - OUTLIER DETECTION AND TREATMENT IN I/O PSYCHOLOGY
T2 - A SURVEY OF RESEARCHER BELIEFS AND AN EMPIRICAL ILLUSTRATION
AU - ORR, JOHN M.
AU - SACKETT, PAUL R.
AU - DUBOIS, CATHY L.Z.
PY - 1991/9
Y1 - 1991/9
N2 - Extreme data points, or outliers, can have a disproportionate influence on the conclusions drawn from a set of bivariate correlational data. This paper addresses two aspects of outlier detection. The results of a survey regarding how published researchers prefer to deal with outliers are presented, and a set of 183 test validity studies is examined to document the effects of different approaches to the detection and exclusion of outliers on effect size measures. The study indicates that: (a) there is disagreement among researchers as to the appropriateness of deleting data points from a study; (b) researchers report greater use of visual examination of data than of numeric diagnostic techniques for detecting outliers; and (c) while outlier removal influenced effect size measures in individual studies, outlying data points were not found to be a substantial source of variance in a large test validity data set.
AB - Extreme data points, or outliers, can have a disproportionate influence on the conclusions drawn from a set of bivariate correlational data. This paper addresses two aspects of outlier detection. The results of a survey regarding how published researchers prefer to deal with outliers are presented, and a set of 183 test validity studies is examined to document the effects of different approaches to the detection and exclusion of outliers on effect size measures. The study indicates that: (a) there is disagreement among researchers as to the appropriateness of deleting data points from a study; (b) researchers report greater use of visual examination of data than of numeric diagnostic techniques for detecting outliers; and (c) while outlier removal influenced effect size measures in individual studies, outlying data points were not found to be a substantial source of variance in a large test validity data set.
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U2 - 10.1111/j.1744-6570.1991.tb02401.x
DO - 10.1111/j.1744-6570.1991.tb02401.x
M3 - Article
AN - SCOPUS:84909358027
SN - 0031-5826
VL - 44
SP - 473
EP - 486
JO - Personnel Psychology
JF - Personnel Psychology
IS - 3
ER -