This study tested the hypothesis that elliptical targets more closely reflect the actual distribution of scores than do circular targets and therefore yield more reliable data. Based on 1000 dart-throws by each of 6 subjects, equations for 5 homothetic ellipses were derived and targets developed. 30 subjects provided data for a test-retest analysis of both the elliptical and conventional circular targets. Greater variability was observed about the vertical axis than about the horizontal axis; however, the test-retest reliabilities of .53 and .69 for the circular and elliptical targets, respectively, were only moderate and not significantly different.
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References
1.
GordonM. H.LovelandE. H.CuretonE. E.An extended table of chi-square for two degrees of freedom, for use in combining probabilities from independent samples. Psychometrika, 1952, 17, 311–316.
