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1 From the Psychology Branch, Environmental Protection Research Division, QM Research and Engineering Center, Natick, Massachusetts
Using the Quartermaster Corps' 10-point mean weighted skin temperature as a criterion, a study was made of the precision with which the mean value might be estimated from fewer points. Three analyses were conducted. One was a comparison of five other methods for obtaining a mean skin temperature in terms of the precision with which they estimated the 10-point mean. The other was an analysis of the relation between the 10-point mean and each of the individual points to determine which points might be omitted without loss of precision. The third was an analysis of the degree to which a single point could be used to provide an estimate of the 10-point mean. The data were obtained from 323 soldiers, subgroups of whom were exposed to 12 different low temperature conditions. It was concluded that: a) the 10-point weighted mean can be estimated with no more than six selected points with no loss in reliability; b) when high reliability is not required, a 3-point weighted mean may suffice; c) at least under the 12 conditions of this study, with the use of regression equations which were developed, the weighted mean may be closely estimated from any one of five selected points; d) at least under the 12 conditions of this experiment, the weighted mean is closely estimated by the uncorrected temperature of the medial thigh.
Submitted on October 24, 1957
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