Tag diagnostik
The Dichotomous Rasch Model: An Introduction
In psychological assessment, tests and questionnaires play a crucial role in measuring various characteristics, such as abilities or personality traits. It is particularly important that these tests produce reliable and precise results. The dichotomous Rasch model, named after the Danish mathematician Georg Rasch, is a fundamental model of item response theory (IRT) that is frequently used in psychological test theory to analyze such data.
Validity in Psychology: Understanding Test Validity
Imagine you are taking a test—let’s say, an intelligence test. What if the result does not actually measure your intelligence, but instead reflects your mood or level of concentration on that particular day? This is exactly where validity comes in. It answers the question: “Does the test actually measure what it is supposed to measure?”
Objectivity: The foundation of reliable assessment
What exactly does objectivity mean, why is it so essential, and how can it be ensured in practice? Here, I’ll give you a comprehensive overview of objectivity as a quality criterion, from its definition to the challenges that arise in practice.
Secondary Quality Criteria in Psychological Research
In psychological research and assessment, tests and procedures are only as good as the criteria used to ensure their quality. Alongside the primary quality criteria—validity, reliability, and objectivity—secondary quality criteria play a crucial role in a test’s practical applicability and acceptance. Here, we take a look at the most important secondary quality criteria and show why they are indispensable for the development and use of psychological tests.
Test Preparation and Administration
The preparation and administration of tests are crucial steps in the diagnostic process. Errors during these phases can significantly impair the meaningfulness and quality of the results.
Interviews as a Diagnostic Method: Insights and Recommendations
Interviews are among the oldest and, at the same time, most versatile methods in psychological assessment. Their use ranges from clinical settings to personnel selection, where they are used, for example, to assess personality traits, cognitive abilities, or social competence. Their flexibility makes them suitable both for exploratory approaches and for highly structured diagnostic questions, underscoring their relevance across a wide range of diagnostic scenarios.
Judgment & Expert Report
Data integration, diagnostic judgment, and psychological reports play a central role in psychological assessment. These concepts form the foundation for making scientifically sound decisions, whether in clinical practice, personnel selection, or other areas of psychological application. In this blog post, we take a closer look at these topics and provide examples that illustrate their practical relevance.
Individual Diagnostic Assessment – Working with Individual Cases
Individual case assessment aims to arrive at the most accurate possible diagnostic judgment for a single person. Here, particular emphasis is placed on the uncertainty of test results, which can arise from measurement error.
Item formulation
Item construction is a central step in developing psychological tests and questionnaires. The goal is to capture the constructs being measured precisely, validly, and reliably. This requires carefully formulating and selecting items in order to minimize measurement errors and achieve meaningful results.
Reliability
Psychological assessment provides a central foundation for research and practice in psychology. To obtain reliable and valid results, assessment procedures must meet high scientific standards. A key criterion in this context is reliability, which will be examined in more detail below.