Factors That Distort Correlations
Factors That Distort Correlations PSYC-31574-003
Popular in Research Methods In Psychology
Popular in Psychlogy
This 1 page Class Notes was uploaded by Amy Turk on Wednesday April 13, 2016. The Class Notes belongs to PSYC-31574-003 at Kent State University taught by Dr. Tanjeem Azad in Spring 2016. Since its upload, it has received 9 views. For similar materials see Research Methods In Psychology in Psychlogy at Kent State University.
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Date Created: 04/13/16
FACTORS THAT DISTORT CORRELATIONS Restricted Range ●Participants’ scores are confined to a narrow range of possible scores ●R is only based on variables that have a linear relationship ○Data points follow a straight line ●In a curvilinear relationship, r = 0 Outliers ●On-line outliers = they exaggerate a nonexistent correlation ●Off-line outliers = they deflate or reduce an existing correlation Unreliable Measures ●Lower correlations ●Introduce erroneous variability = creates “noisy” data ●Noisy data obscures the relationships between variables Correlation Does Not Imply Causation ●Third variable problem = hidden variable may be responsible for the relationship between variable A and variable B ○Hidden variable C
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