Related Experiment Video
Updated: Mar 21, 2026

Use of a Psychophysiological Script-driven Imagery Experiment to Study Trauma-related Dissociation in Borderline Personality Disorder
Published on: March 8, 2018
Reliability of Therapist Effects in Practice-Based Psychotherapy Research: A Guide for the Planning of Future Studies
Anne-Katharina Schiefele1, Wolfgang Lutz2, Michael Barkham3
1Clinical Psychology and Psychotherapy, Department of Psychology, University of Trier, 54286, Trier, Germany. schiefele@uni-trier.de.
Abstract:
This paper aims to provide researchers with practical information on sample sizes for accurate estimations of therapist effects (TEs). The investigations are based on an integrated sample of 48,648 patients treated by 1800 therapists. Multilevel modeling and resampling were used to realize varying sample size conditions to generate empirical estimates of TEs. Sample size tables, including varying sample size conditions, were constructed and study examples given. This study gives an insight into the potential size of the TE and provides researchers with a practical guide to aid the planning of future studies in this field.
Related Concept Videos
Elements Crucial for Effective Psychotherapy
The Therapeutic Alliance
The therapeutic alliance refers to the relationship between the therapist and the client. The alliance strengthens when the therapist and the client engage in a nurturing, supportive, trusting, empathetic, and respectful relationship, improving therapeutic outcomes. Therapists must monitor this relationship...
Psychodynamic Therapy
Psychotherapy
Interpersonal Psychotherapy
Modeling in Therapy
Participant Modeling
Participant modeling involves therapists demonstrating calm and effective behaviors in...
Family Therapy
Strategic Family Therapy
Strategic family therapy emphasizes resolving communication barriers and improving problem-solving abilities...