Abstract
A common practice among clinicians and counselors is the administration of comprehensive personality inventories to their clients, followed by examination of the various inter-scale, intra-profile comparisons which are possible. The significant difference scores are then examined for theoretical significance, and diagnosis or placement directives may be based on them. A method is derived in which the magnitude of the critical difference (which an obtained difference score must equal or exceed in order to be considered statistically significant at α < .05) is a function of the number of comparisons being made and the average individual reliability of the K scales. A nomograph is provided from which the critical difference may be read directly.

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