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In intervention research, single-case experimental designs are an important way to gain insights into the causes of individual changes that yield high internal validity. They are commonly applied to examine the effectiveness of classroom-based interventions to reduce problem behavior in schools. At the same time, there is no consensus on good design characteristics of single-case experimental designs when dealing with behavioral problems in schools. Moreover, specific challenges arise concerning appropriate approaches to analyzing behavioral data. Our study addresses the interplay between the test power of piecewise regression analysis and important design specifications of single-case research designs. Here, we focus on the influence of the following specifications of single-case research designs: number of measurement times, the initial frequency of the behavior, intervention effect, and data trend. We conducted a Monte-Carlo study. First, simulated datasets were created with specific design conditions based on reviews of published single-case intervention studies. Following, data were analyzed using piecewise Poisson-regression models, and the influence of specific design specifications on the test power was investigated. Our results indicate that piecewise regressions have a high potential of adequately identifying the effects of interventions for single-case studies. At the same time, test power is strongly related to the specific design specifications of the single-case study: Few measurement times, especially in phase A, and low initial frequencies of the behavior make it impossible to detect even large intervention effects. Research designs with a high number of measurement times show robust power. The insights gained are highly relevant for researchers in the field, as decisions during the early stage of conceptualizing and planning single-case experimental design studies may impact the chance to identify an existing intervention effect during the research process correctly.
Dieser Beitrag diskutiert die diagnostischen Kompetenzen Lehramtsstudierender vor allem in Bezug auf internalisierende Verhaltensbesonderheiten. Da diese häufig weniger Einfluss auf den Verlauf des Schulalltags von Lehrpersonen haben als externalisierendes Erleben und Verhalten von Kindern, werden internalisierende Verhaltensbesonderheiten von Kindern häufig seltener wahrgenommen und seltener als pädagogisch relevant eingestuft. Daher erfahren diese Kinder oft weniger förderdiagnostische Unterstützung. Mit dem Ziel der Entwicklung diesbezüglicher diagnostischer Kompetenzen der Studierenden wird das Psychodiagnostische Praktikum (PDP) mit praktischen Abschnitten und begleitenden Seminarsitzungen zeitgleich zum Praxissemester durchgeführt. Um Veränderungen in der Selbstwahrnehmung der Studierenden in Bezug auf ihre diagnostischen Kompetenzen im Rahmen des PDP abzubilden und damit das Gesamtkonzept zu evaluieren, wird ein selbstentwickelter Fragebogen verwendet. Der Beitrag stellt die konzeptuellen Gedanken des Fragebogens sowie die Ergebnisse einer ersten Pilotstudie vor.