Degree of redundancy between time, importance, and frequency task ratings

Article Abstract:

Redundancy among relative-time-spent, importance, and frequency task rating scales was examined. Research and development managers (N = 117) from 9 organizations completed a task inventory on all 3 scales. For both job-level and individual data, difference scores were small between time and importance task ratings but were much larger between other pairs of scales. Scale intercorrelations were low to moderate for individual dat but quite variable among jobs. The striking difference-score findings remained consistent even among jobs that differed considerably in their scale intercorrelations. It is concluded that time and importance ratings may be redundant and that difference scores may be more diagnostic of redundancy than are correlations. (Reprinted by permission of the publisher.)

Methods, Evaluation, Psychological tests, Task analysis, Job analysis, Scale analysis (Psychology)

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Restriction of Pursuit Eye Movement Range during a Concurrent Auditory Task

Article Abstract:

A two-tiered study was conducted which employed ten unsuspecting men. It measured the impact of concurrent auditory dot/dash identification work on pursuit eye movements. A one-fifth restriction of range was identified as task induced. Increasing the presentation rate by two caused a one-twentieth addition in restriction of this eye action. Prior awareness and practice did not significantly impact the restriction. Implications for dynamic visual displays like low-level television and view-ahead infrared are discussed. Tables and graphs of related statistical data are included.

Equipment and supplies, Men

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An Analysis of Correlations Corrected for Attenuation and Range Restriction

Article Abstract:

An empirical method is used to find the bias in correlation coefficients which have been adjusted for attenuation and range restriction. Asymptotic methodology is then used to analyze the properties inherent to double corrected correlation. A negative bias is found. It decreases where sample size expands or selection ratio expands. A term for confidence interval estimation is developed. While the standard error of corrected correlation is greater than in uncorrected correlation the gain is less than the increase in point estimates. A table of related ratios is included.

Education, Samples (Merchandising), Samples (Products)

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