PLACING VERBAL DESCRIPTORS ON A RATIO SCALE
In an article 2001 Gunnar and Elisabet Borg made a careful examination of the different principles involved in the construction of Category-Ratio (CR) scales. One of these principles is to obtain congruence between anchors and numbers, using the relation found by Stevens and Galanter (1957) between a category and a ratio scale. In an experiment 29 subjects judged lifted weights with free magnitude estimation (part A) and on a 7-point category scale (part B). For magnitude estimation an exponent of n=1,22 was obtained and for the category scale the exponent was n=0,47. From this result a simple CR-scale was constructed giving good support to the position of the anchors on the Borg CR100 scale. Secondly, a transformation equation based on Eisler (1962) and Borg, G., and Borg, P. (1987) was used as another way to obtain ratio data from category data. Both methods were found to work well.