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ERIC Number: ED109229
Record Type: Non-Journal
Publication Date: 1974-Dec
Pages: 18
Abstractor: N/A
Reference Count: N/A
A Comment on the "Known-Interval" Scale as a Measure of Attitude.
Steinfatt, Thomas M.
The known interval scale, referred to as the 7.8 scale, has been criticized as an invalid measuring instrument in the form of an attitude scale. It is the purpose of this paper to demonstrate that this scale can produce spuriously inflated correlation coefficients, high reliability, and false significance on statistical tests. The case will be made along two general lines. First, the effects of the scale on reliability, validity, and significance testing will be presented and second the reasoning behind the scale and the method for attaining its values will be discussed. It is concluded that increases in reliability and validity coefficients obtained with the 7.8 scale only confirm that by artificially extending the range of a scale it is possible to increase the correlation coefficient. The application of the Jones and Thurstone scale to the 7.8 scale, whether transcribed correctly or incorrectly, happens to form a non-monotonic transformation, with resultant r and increased chance for significance, which makes the scale appealing on its surface. Reliability and validity, to be useful concepts, must be the reliability and validity of data gathering instruments rather than the reliability and validity of a particular set of scale values. (Author/BJG)
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A