This paper reports an application of Samejima's latent trait model for continuous responses. A brief review of latent trait theory is presented, including an elaboration of the theory for test responses other than dichotomous responses, in order to put the continuous model in perspective. The model is then applied using the Impulsivity and Harmavoidance scales of Jackson's Personality Research Form. Special attention is given to the requirement that the model be invariant across populations and sex groups. Results showed that responses from males fit the model better than those from females, es pecially for the Harmavoidance scale. The practical and theoretical implications of the study are dis cussed.
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