Information Transfer in Display-Control Systems VII. Short Computational Methods for and Validity of the DEI Technique
Quarterly progress rept. no. 7, 16 Dec 1962-15 Mar 1963
APPLIED PSYCHOLOGICAL SERVICES INC WAYNE PA
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Several short methods for computing the Display Evaluative Index DEI are first described. The first method eliminates the requirements for calculating the values for the three factors comprising the DEI. Although the method does not generally provide an exact value for the DEI, it does provide an approximate value. The method is similar to linear extrapolation and is exact to the extent that the fractional changes of the variables involved are small. A second short computational method is presented which provides exact relative DEIs. This method uses fractional increments and is recommended for use in computing DEIs when 1 only two or three variations of design are involved, and 2 the increments are known. The third method employs a digital compute for computing DEIs. The DEI was applied to several additional Signal Corps systems and to hypothetical variations of these systems. The results of these applications again suggested that the technique possesses adequate evaluative sensitivity for distinguishing between various designs of the same system. A final validity study indicated that the DEI possesses adequate empirical validity.
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