ACCURACY AND VARIABILITY OF DIRECT ESTIMATES OF BEARING FROM LARGE DISPLAY SCREENS.
MOUNT HOLYOKE COLL SOUTH HADLEY MASS PSYCHOPHYSICAL RESEARCH UNIT
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A series of studies of the estimation of bearing indicates that a surprising degree of accuracy can be attained when a large number of estimates are combined. This group accuracy can be attained without special training and without the aid of bearing markers, thanks to the fact that the normal individual has a fairly clear notion, under normal conditions, of the location of the vertical and horizontal and can, with somewhat reduced accuracy, make interpolations between them. Findings indicate that there is no appreciable difference between men and women in this report. Individual accuracy and variability are relatively independent of the length of the line whose bearing is to be judged, and of its distance from the center of the display screen, but the introduction of a reference line or bearing marker increases the accuracy and lowers the variability of estimates. The stabilizing effect of such a reference line extends over a sufficient distance to suggest that a grid composed of a small number of lines might be sufficient to insure adequate accuracy. Presumably this would mean a saving in the time required for making the estimates, without sacrificing accuracy. Author
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