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MSP 6 is coming soon! We are working on a better, and more complete version, suitable for all Windows versions.
MSP, Mokken Scaling for Polytomous items, offers scaling facilities for the cumulative nonparametric item response theory.
Measurement of latent attributes occurs in all social and behavioral sciences. From the responses of persons to a number of items or questions indicative of the latent trait, scale scores for the persons are obtained and the quality of the measurement instrument is evaluated. MSP is a simple and flexible tool for this task, widely applicable because it is based on mild statistical assumptions. It can be used, for both dichotomous and polytomous data.