Weight scales from ratio judgments and comparisons of existent weight scales.

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Abstract
To investigate various aspects of methodology and characteristics of ratio judgments in the constant sum method of scaling, 2 experiments were carried out with 9 weights ranging between 108.5 and 919.8 g. Experiment I involved 20 subjects who divided 100 points between pairs of weights to express ratio judgments, while Experiment II had 10 subjects express their ratio judgment of the same pairs directly, i.e., say how many times heavier the one weight felt in comparison to the other. With appropriate computations the judgment data were used to derive psychological scales for the 2 conditions. Results showed fairly close approximation to the physical scale, but judgments were influenced by mode of communication, similarity of stimuli within pairs, and by order of lifting. Computational procedures also affect final scale values. The obtained scales were compared with 5 other weight scales. It was concluded that different methodologies permit different sets of judgment determinants to operate; thus none of the scales agrees completely with any other scale.
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