Most research methodology in the behavioral sciences employs interindividual analyses, which provide information about the state of affairs of the population. However, as shown by classical mathematical-statistical theorems (the ergodic theorems), such analyses do not provide information for, and cannot be applied at, the level of the individual, except on rare occasions when the processes of interest meet certain stringent conditions. When psychological processes violate these conditions, the interindividual analyses that are now standardly applied have to be replaced by analysis of intraindividual variation in order to obtain valid results. Two illustrations involving analysis of intraindividual variation of personality and emotional processes are given.

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This study analyzed Carl Rogers's session with Gloria in Three Approaches to Psychotherapy (E. L. Shostrom, 1965a) to determine how Rogers's conversational style functioned to enact his core conditions of empathy, genuineness, and unconditional positive regard. Rogers's conversational style was found to be congruent with his espoused theory as well as a catalyst for client‐centered counseling. The authors suggest that despite the film's popularity, the “client‐centeredness” of the therapeutic interaction between Carl Rogers and Gloria has been previously underrecognized.

A values characterization of the RIASEC occupational interest categories was developed using the U.S. Department of Labor's O*NET occupational data. Values profile plots were constructed for each interest category, then correspondence analysis and canonical correlation were carried out to assess the relationship between the interest and values categories. Suggestions for the use of values information in a counseling context are presented.

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