Accession Number : AD0658891

Title :   SPECIAL PROBLEMS IN THE ESTIMATION OF BEARING.

Descriptive Note : Memorandum rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD

Personal Author(s) : Reese,T. W. ; Volkmann,J. ; Rogers,S. ; Kaufman,E. L.

Report Date : 15 JAN 1948

Pagination or Media Count : 49

Abstract : The subjects were asked the following special questions: (1) What effect has the length of the line of light whose bearing is to be judged on the accuracy and variability of the subject's judgments. (The line whose bearing is to be judged is referred to as the bearing indicator). (2) What happens to accuracy and variability when only the outer tip of the bearing indicator is shown. (3) What is the size of the individual differences in both accuracy and variability, and is there any relation between accuracy and variability, that is, do the most accurate subjects tend to be the least variable. The answers to these questions are: First, changing the length of the bearing indicator over a wide range (from 93% of the radius of the display screen to only 6.6% of the radius) had little effect on either the accuracy or the variability of the subjects' estimates. Secondly, the outer tip seems to be the most effective portion of the bearing marker in making accurate judgments of bearing. In fact, under the conditions of this experiment, accuracy is increased and variability reduced when only this portion of the marker is shown. Thirdly, the most accurate subject was about three times more accurate than the least accurate subject. (Author)

Descriptors :   (*DIRECTION FINDING, PERFORMANCE(HUMAN)), ACCURACY, DECISION MAKING, DISPLAY SYSTEMS, TARGETS, NAVAL PERSONNEL

Subject Categories : Psychology
      Direction Finding
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE