A scale purification procedure for evaluation of differential item functioning

Khalid, Muhammad Naveed; Glas, Cornelis A.W.

doi:10.1016/j.measurement.2013.12.019

Cited by 12 publications

(14 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A scale purification procedure that involves assigning group-specific parameters to items flagged for DIF was used to model between country differences in response behavior [23–26]. This is an iterative procedure in which the item with the largest cross-cultural DIF according to the LM test is assigned group-specific items parameters first, and the model is rerun to see if bias in other items persists [18]. Iterations were stopped once the fit of the model could no longer be improved.…”

Section: Methodsmentioning

confidence: 99%

“…As long as there are sufficient numbers of DIF free items, the different language versions will still be in the same IRT metric. Modeling DIF in this way is an effective way to adjust the scores for DIF and preserve comparability of scores [18]. The impact of cross-cultural DIF on the comparability of the raw scores across different language versions of the PROM can be evaluated by examining the distance between an item’s unadjusted and DIF adjusted ICF’s on the latent variable or equivalently the differences between the adjusted and unadjusted predicted scale scores [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Psychometric properties and cross-language equivalence of the revised Bristol Rheumatoid Arthritis Fatigue and the Rheumatoid Arthritis Impact of Disease scales in rheumatoid arthritis

et al. 2019

View full text Add to dashboard Cite

Objective To assess psychometric properties and cross-language measurement equivalence of six versions of the Bristol Rheumatoid Arthritis Fatigue Scale (BRAF-MDQ) and the Rheumatoid Arthritis Impact of Disease Score (RAID in rheumatoid arthritis (RA). Methods Both questionnaires were completed by French ( n = 206), German ( n = 206), Dutch ( n = 317), Spanish ( n = 157), Swedish ( n = 170) and UK ( n = 210) RA patients. The presence of cross-language differential item functioning (DIF) was examined using the generalized partial credit model. The impact of DIF on the item and total scores was examined by comparing DIF unadjusted and DIF adjusted expected item and scale scores. IRT-based methods were used to assess psychometric properties of the instruments. Results 11 of the 20 BRAF-MDQ (55%) and 4 of the 7 RAID items (57%) exhibited significant DIF in at least one of the six countries. The mean number of items with DIF per country was 2.6 for BRAF-MDQ and 1.1 for RAID. However, the impact of DIF on the total RAID and BRAF-MDQ scores, as well as the BRAF subscales, was found to be negligible at the group level. Only for the BRAF physical subscale was there evidence of minor DIF. Marginal reliabilities of BRAF-MDQ (0.93) and RAID (0.89) were excellent, and precise scores could be obtained across the spectrum of disease impact and fatigue scores measured by these PROMs. Conclusion This study supports the cross-language measurement equivalence of BRAF-MDQ and RAID and provides further support for the psychometric properties of these measures in RA. Electronic supplementary material The online version of this article (10.1007/s11136-019-02188-8) contains supplementary material, which is available to authorized users.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Psychometric properties and cross-language equivalence of the revised Bristol Rheumatoid Arthritis Fatigue and the Rheumatoid Arthritis Impact of Disease scales in rheumatoid arthritis

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Because these statistics have been shown to have high “false alarm” rates as sample size goes up [ 45 ], items were flagged for DIF or lack of fit in case of a significant LM test and > ± 0.05, as recommended by Glas and Falcón. DIF affected items were assigned subgroup item parameters [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

Towards standardized patient reported physical function outcome reporting: linking ten commonly used questionnaires to a common metric

et al. 2018

View full text Add to dashboard Cite

ObjectivesOutcomes obtained using different physical function patient reported outcome measures (PROMs) are difficult to compare. To facilitate standardization of physical function outcome measurement and reporting we developed an item response theory (IRT) based standardized physical function score metric for ten commonly used physical function PROMs.MethodsData of a total of 16,386 respondents from representative cohorts of patients with rheumatic diseases as well as the Dutch general population were used to map the items of ten commonly used physical function PROMs on a continuous latent physical function variable. The resulting IRT based common metric was cross-validated in an independent dataset of 243 patients with gout, osteoarthritis or polymyalgia in which four of the linked PROMs were administered.ResultsOur analyses supported that all 97 items of the ten included PROMs relate to a single underlying physical function variable and that responses to each item could be described by the generalized partial credit IRT model. In the cross-validation analyses we found congruent mean scores for four different PROMs when the IRT based scoring procedures were used.ConclusionsWe showed that the standardized physical function score metric developed in this study can be used to facilitate standardized reporting of physical function outcomes for ten commonly used make physical function PROMs.Electronic supplementary materialThe online version of this article (10.1007/s11136-018-2007-0) contains supplementary material, which is available to authorized users.

show abstract

“…For instance, the local independence of practices and farmers is violated when systematic groups of sample farmers respond differently to practices, a condition known as differential item functioning (DIF). DIF occurs when different sub-groups of farmers (for example males and females) have different probabilities of engaging in a behaviour (Karami 2012;Khalid and Glas 2013;Opariuc-Dan et al, 2017). This occurs either because the behaviour is technically biased towards one group, or the groups belong to different attitude distributions (Briggs, 2008;Karami, 2012;Opariuc-Dan et al, 2017).…”

Section: Assessment Of Farmers' Attitudes: Classical Versus Behavioural Approachmentioning

confidence: 99%

Assessing farmers’ attitudes to, and the behavioural costs of, organic fertiliser practices in northern Ghana: An application of the behavioural cost approach

Daadi

Latacz‐Lohmann

2021

Heliyon

View full text Add to dashboard Cite

The use of organic fertiliser to improve soil health is crucial to halting the downward trend of crop yields in sub-Saharan Africa. If this goal is to be achieved, however, farmers require support to adopt organic fertiliser practices that match their attitudes and decision-making capacity. This study evaluated farmers' attitudes to a set of prevailing organic fertiliser practices and their associated behavioural costs (difficulty). The explanatory Rasch model was applied to a set of primary data from 250 farming households in north-east Ghana. The results showed that the average attitude of farmers was much less than the difficulty estimate of an average organic fertiliser practice, although the practices generally showed a moderate difficulty. On average, farmers' attitudes matched just three of sixteen practices on the scale, with most (70 %) of the farmers showing very weak attitudes towards the input. Latent regression results revealed that the weak attitude levels were strongly related to key factors in the farmers' background, including education, resource endowment and access to extension services. Participation in determining policies on organic fertiliser use enhances farmers' knowledge and skills concerning use of the input. Hence, access to such policies can replace education for the less-educated majority of farmers. Thus, training programmes are proposed that develop the average farmer's capacity to adopt these practices in this area, especially the less difficult ones. Supporting farmers with the acquisition of animal-drawn vehicles can also facilitate uptake of the more difficult organic fertiliser practices and increase use of the input.

show abstract

A scale purification procedure for evaluation of differential item functioning

Cited by 12 publications

References 56 publications

Psychometric properties and cross-language equivalence of the revised Bristol Rheumatoid Arthritis Fatigue and the Rheumatoid Arthritis Impact of Disease scales in rheumatoid arthritis

Psychometric properties and cross-language equivalence of the revised Bristol Rheumatoid Arthritis Fatigue and the Rheumatoid Arthritis Impact of Disease scales in rheumatoid arthritis

Towards standardized patient reported physical function outcome reporting: linking ten commonly used questionnaires to a common metric

Assessing farmers’ attitudes to, and the behavioural costs of, organic fertiliser practices in northern Ghana: An application of the behavioural cost approach

Contact Info

Product

Resources

About