Title

Empirical Statistics: V. Evidence On The Extent Of The Steepness Bias In Visual Estimation Of Trends

Abstract

The existence of a pervasive and pronounced steepness bias in visually fitting a line to data in a scattergraph was investigated. 262 undergraduate business students were asked to fit lines visually to scattergraphs, to correspond to a least squares regression fit. These visually estimated lines strongly overestimated the steepness of the actual trend. As visual inspection of data is an important step for the detection of linear trends and outliers prior to regression analysis, this bias in subjective perception of the line may result in inappropriate deletion or retention of outliers, transferring the subjective bias into the results of least squares regression. In addition, textbooks on management accounting discuss the use of visually fitted lines to estimate cost behavior.

Publication Date

1-1-1996

Publication Title

Perceptual and Motor Skills

Volume

84

Issue

3

Number of Pages

731-734

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.2466/pms.1996.82.3.731

Socpus ID

1842639898 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/1842639898

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