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Applied Psychological Measurement, Vol. 5, No. 3,
377-382 (1981)
DOI: 10.1177/014662168100500311
Evaluating Goodness of Fit in Nonmetric Multidimensional Scaling by ALSCAL
Robert MacCallum
The Ohio State University
Two types of information are provided to aid users of ALSCAL in evaluating goodness of fit in nonmetric two-way and three-way multidimensional scaling analyses. First, equations are developed for estimating the expected values of SSTRESS and STRESS for random data. Second, a table is pro vided giving mean values of SSTRESS and STRESS for structured artificial data. This information pro vides the empirical investigator with a second com parative basis for evaluating values of these indices.

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