The general problem upon which the writer is engaged (21) has as one of its objectives the discovery of the extent to which individual differences among rats in the learning of a T-maze are determined by genetic or hereditary factors. Before this can be satisfactorily accomplished, however, it is necessary to determine the degree to which the differences between individuals are caused by chance factors, commonly called errors of measurement. If the r61e of chance factors as differentiae is negligible, then, obviously, the differences between individuals are caused entirely by systematic factors, and it will remain for us only to determine what portion of these systematic factors are genetic. The task of ascertaining the r61e of unsystematic chance factors in the causation of individual differences among rats will be attacked in this paper. The procedure is, in essence, that of determining the reliability coefficient of the maze measures, for from this coefficient we may discover the r&le played by errors of measurement. The problem is not only of importance to our inheritance experiment, but it should be of interest to maze ex-

Errors of sampling and of measurement as affecting difference between means.

Studies in individual differences in maze ability. I. The measurement of the reliability of individual differences.

http://psycnet.apa.org/journals/com/9/3/191.pdf

Errors of sampling and of measurement as affecting difference between means.

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Studies in individual differences in maze ability. I. The measurement of the reliability of individual differences.

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