Abstract
During the course of an investigation (2) involving serial measurements of apparent electrical skin resistance in human infants and adults, It became evident that subjects whose general level of resistance was low maintained a nearly constant level of resistance throughout a two-hour observation period. On the other hand when the resistance was high large fluctuations were noted. When the means in ohms of series of measures taken at five-minute intervals were correlated with the standard deviations of the deflections, the coefficient of correlation was .83 for infants and adults, and .94 for adults only. It follows that series of measures from differing levels may not be compared unless the data have been rendered comparable. Of the several techniques for comparing data which show a constant relationship, standard measures or Z-scores, as Kelley (1) has termed them, have been chosen because the mean and standard deviation from which they are derived are the most reliable measures of central tendency and variability.
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