Letty Koopman

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University of Groningen

Netherlands

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Recent Grants

Grant: Close

Gustafsson & Skrondal Visiting Scholarship: Progressive Psychometrics -- Validating, Starting, Stopping, and Scoring Adaptive Progressive Tests

Open Date: 2022-01-01

Close Date: 2023-01-01

Grant: Close

NWO Research Talent Grant: Scaling Methods for Multilevel Test Data

Open Date: 2016-11-01

Close Date: 2022-10-01

Articles (7)

Year:

2025

Year:

2025

Year:

2023

Year:

2023

Year:

2022

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2020

Year:

2020

Collaborators (3)

Bonne J.H. Zijlstra

Academic, Assistant Professor, null

University of Amsterdam

NETHERLANDS

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L. Andries Van der Ark

University of Amsterdam

NETHERLANDS

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Wicher Bergsma

Professor

UNITED KINGDOM

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Letty Koopman

Research Interests

Explore related searches

Contact this professor

Recent Grants

Articles (7)

Investigating the Ordering Structure of Clustered Items Using Nonparametric Item Response Theory

Assumptions and Properties of Two-Level Nonparametric Item Response Theory Models

Evaluating Model Fit in Two-Level Mokken Scale Analysis

Maximum Augmented Empirical Likelihood Estimation of Categorical Marginal Models for Large Sparse Contingency Tables

A two-step, test-guided Mokken scale analysis, for nonclustered and clustered data

Standard errors of two‐level scalability coefficients

Bias of Two-Level Scalability Coefficients and Their Standard Errors

Collaborators (3)

Bonne J.H. Zijlstra

L. Andries Van der Ark

Wicher Bergsma

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