Correlations of achievement within an individual.

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Abstract
Examined intra-individual correlation, and the minor deviations therein, that occur from time to time, when the conditions of general health, motivation, interest, and the like are as constant as it is possible to maintain them, when the general course of fatigue is avoided, and the changes due to practice improvement are so far as possible eliminated. Six individuals submitted to measurement in a variety of simple tasks, working continuously for the hours of an ordinary working day, for a number of days. Every half hour the series of tasks was accomplished, and immediately thereupon began the next round of performances. After 40 trials the practice improvement in all of the processes was practically eliminated, and the forenoon trials of all days were made under conditions as constant as it was possible to produce. Six trials were thus made in each forenoon, for seven days, after forty practice trials had already been accomplished. The study of these 42 trials, in six processes, affords material for a study of the questions raised. The tests examined were: Tapping, Steadiness, Three-hole Coordination, Color Naming, Substitution, and Pulse Rate. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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