A second-order ratio scale

definition of the method. ~im~arity was lation (3) where the scale was anat hot h ends (;I and 10). e ratio level. It might be argued, hoTvever,

150 X 2 110mm, circles e ‘circles were 10, 2 ere two different circles, an S’I that there were 1

the subject was ins 0 circles on ea e pitc e~iment.

ig. 1.

GttfeE;TA EKMAN and YVONNE WA

0

1

2

3 Ratio

scale

i

S

6

7

of slmiiority

Fi;;. 2. The scale from Experiment 1 plotte:;i against the ratio scale (with an arbitrary unit of measurement) from Experiment 2.

estimates obtained by the method used in Experiment 1 - as in the previous pitch exper i_ment- may be treated as measures on the ratio level. REFERENCES 1. E&r, H., & Ekman, G.: A mechanism sf subjective similarity. Acfa Psychof., 1959, If, l-10 & Nurd.Psykof., 1959, 11, l-10. *. ‘, Ekman, Ci.: Two generalized ratio scaling methc&. J. Psychol., 1958, 45, 287-295. 3. Stevens, :S. S., & Galanter, E. H.: Ratio scales and category scales for a dozen percept1 Cal continua. J. exp. Psychol., 1957, 54, 377-411.