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Letty Koopman

5PUBLICATIONS

3CO-AUTHORS

Information governance, policy and ethicsStochastic analysis and modellingEconometric and statistical methods

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Publications (5)

Sort by Publication Date:

|Nov 20, 2024

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

Letty Koopman, Johan Braeken

|Sep 26, 2023

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

L Andries van der Ark, Wicher P Bergsma, Letty Koopman

|May 13, 2021

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

Letty Koopman, Bonne J H Zijlstra, L Andries van der Ark

|Apr 29, 2020

Bias of Two-Level Scalability Coefficients and Their Standard Errors.

Letty Koopman, Bonne J H Zijlstra, Mark de Rooij

|Jun 25, 2019

Standard errors of two-level scalability coefficients.

Letty Koopman, Bonne J H Zijlstra, L Andries van der Ark

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Frequent Collaborators

3 joint publications

L Andries van der Ark

2 joint publications

Bonne J H Zijlstra

1 joint publications

Wicher P Bergsma

Frequent Collaborators

3 joint publications

L Andries van der Ark

2 joint publications

Bonne J H Zijlstra

1 joint publications

Wicher P Bergsma

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