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Chance Baselines for INDSCAL's Goodness-of-Fit Index

The Ball Foundation, 800 Roosevelt Road, Building C, Suite 206, Glen Ellyn IL 60137, U.S.A.

For purposes of evaluating INDSCAL's goodness- of-fit index (R_I), random data were generated for var ious combinations of N (the number of individuals), ranging from 3 to 30, and n (the number of stimuli), ranging from 10 to 40. Results from INDSCAL anal yses of random data were then used to provide an easy-to-use equation for estimating the expected value of R_I, as a function of N, n, and r (the number of di mensions). The equation was highly successful in pre dicting expected values of R_I for random data, as indi cated by a multiple correlation of .9965.

Applied Psychological Measurement, Vol. 9, No. 1, 27-30 (1985)
DOI: 10.1177/014662168500900102


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