1971 Volume 13 Issue 2 Pages 51-59
The data obtained by 7 point scale rating method (SD Method) are compared with those by 6 point scale rating method in which without mid-point scale is presented.
Two example of the data obtained by 7 point scale and 6 point scale rating method for three-color harmony and impression formation of photograph are given. The problem on fluctuation of response of mid-point scale is discussed from the theoretical point of view based on the response error model.