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The two-parameter graded response latent trait model was applied to data collected from a conven tionally constructed Likert-type attitude scale. Com parisons were made of both the person latent trait esti mates and the item parameter estimates with their counterparts from the conventional scaling method. Also studied were the goodness of fit of the graded re sponse model and the information function feature of the model indicating the precision of measurement at each level of the attitude trait continuum. The results demonstrated that the graded response model could be successfully used to perform attitude measurement for Likert scales.
W Koch (Sat,) studied this question.