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27-05-2021 | Special Section: Non-parametric IRT

More flexible response functions for the PROMIS physical functioning item bank by application of a monotonic polynomial approach

Auteurs: Carl F. Falk, Felix Fischer

Gepubliceerd in: Quality of Life Research | Uitgave 1/2022

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Abstract

Purpose

In developing item banks for patient reported outcomes (PROs), nonparametric techniques are often used for investigating empirical item response curves, whereas final banks usually use parsimonious parametric models. A flexible approach based on monotonic polynomials (MP) provides a compromise by modeling items with both complex and simpler response curves. This paper investigates the suitability of MPs to PRO data.

Method

Using PROMIS Wave 1 data (N = 15,725) for Physical Function, we fitted an MP model and the graded response model (GRM). We compared both models in terms of overall model fit, latent trait estimates, and item/test information. We quantified possible GRM item misfit using approaches that compute discrepancies with the MP. Through simulations, we investigated the ability of the MP to perform well versus the GRM under identical data collection conditions.

Results

A likelihood ratio test (p < 0.001) and AIC (but not BIC) indicated better fit for the MP. Latent trait estimates and expected test scores were comparable between models, but we observed higher information for the MP in the lower range of physical functioning. Many items were flagged as possibly misfitting and simulations supported the performance of the MP. Yet discrepancies between the MP and GRM were small.

Conclusion

The MP approach allows inclusion of items with complex response curves into PRO item banks. Information for the physical functioning item bank may be greater than originally thought for low levels of physical functioning. This may translate into small improvements if an MP approach is used.
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Metagegevens
Titel
More flexible response functions for the PROMIS physical functioning item bank by application of a monotonic polynomial approach
Auteurs
Carl F. Falk
Felix Fischer
Publicatiedatum
27-05-2021
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 1/2022
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-021-02873-7