Enhanced Interpretation of Instrument Scales Using the Rasch Model
Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Thompson, John R. [verfasserIn] |
|---|
| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2007 |
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| Anmerkung: |
© Drug Information Association, Inc 2007 |
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| Übergeordnetes Werk: |
Enthalten in: Therapeutic innovation & regulatory science - [New York] : Springer Nature, 2013, 41(2007), 4 vom: Juli, Seite 541-550 |
|---|---|
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volume:41 ; year:2007 ; number:4 ; month:07 ; pages:541-550 |
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10.1177/009286150704100413 |
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| 520 | |a Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. | ||
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| 700 | 1 | |a Reichel, Martin |4 aut | |
| 700 | 1 | |a Wolf, Sebastian |4 aut | |
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10.1177/009286150704100413 doi (DE-627)SPR038917084 (SPR)009286150704100413-e DE-627 ger DE-627 rakwb eng Thompson, John R. verfasserin aut Enhanced Interpretation of Instrument Scales Using the Rasch Model 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Drug Information Association, Inc 2007 Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. Cappelleri, Joseph C. aut Getter, Christine aut Pleil, Andreas aut Reichel, Martin aut Wolf, Sebastian aut Enthalten in Therapeutic innovation & regulatory science [New York] : Springer Nature, 2013 41(2007), 4 vom: Juli, Seite 541-550 (DE-627)739896415 (DE-600)2708397-4 2168-4804 nnns volume:41 year:2007 number:4 month:07 pages:541-550 https://dx.doi.org/10.1177/009286150704100413 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_120 GBV_ILN_121 GBV_ILN_150 AR 41 2007 4 07 541-550 |
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10.1177/009286150704100413 doi (DE-627)SPR038917084 (SPR)009286150704100413-e DE-627 ger DE-627 rakwb eng Thompson, John R. verfasserin aut Enhanced Interpretation of Instrument Scales Using the Rasch Model 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Drug Information Association, Inc 2007 Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. Cappelleri, Joseph C. aut Getter, Christine aut Pleil, Andreas aut Reichel, Martin aut Wolf, Sebastian aut Enthalten in Therapeutic innovation & regulatory science [New York] : Springer Nature, 2013 41(2007), 4 vom: Juli, Seite 541-550 (DE-627)739896415 (DE-600)2708397-4 2168-4804 nnns volume:41 year:2007 number:4 month:07 pages:541-550 https://dx.doi.org/10.1177/009286150704100413 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_120 GBV_ILN_121 GBV_ILN_150 AR 41 2007 4 07 541-550 |
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10.1177/009286150704100413 doi (DE-627)SPR038917084 (SPR)009286150704100413-e DE-627 ger DE-627 rakwb eng Thompson, John R. verfasserin aut Enhanced Interpretation of Instrument Scales Using the Rasch Model 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Drug Information Association, Inc 2007 Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. Cappelleri, Joseph C. aut Getter, Christine aut Pleil, Andreas aut Reichel, Martin aut Wolf, Sebastian aut Enthalten in Therapeutic innovation & regulatory science [New York] : Springer Nature, 2013 41(2007), 4 vom: Juli, Seite 541-550 (DE-627)739896415 (DE-600)2708397-4 2168-4804 nnns volume:41 year:2007 number:4 month:07 pages:541-550 https://dx.doi.org/10.1177/009286150704100413 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_120 GBV_ILN_121 GBV_ILN_150 AR 41 2007 4 07 541-550 |
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10.1177/009286150704100413 doi (DE-627)SPR038917084 (SPR)009286150704100413-e DE-627 ger DE-627 rakwb eng Thompson, John R. verfasserin aut Enhanced Interpretation of Instrument Scales Using the Rasch Model 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Drug Information Association, Inc 2007 Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. Cappelleri, Joseph C. aut Getter, Christine aut Pleil, Andreas aut Reichel, Martin aut Wolf, Sebastian aut Enthalten in Therapeutic innovation & regulatory science [New York] : Springer Nature, 2013 41(2007), 4 vom: Juli, Seite 541-550 (DE-627)739896415 (DE-600)2708397-4 2168-4804 nnns volume:41 year:2007 number:4 month:07 pages:541-550 https://dx.doi.org/10.1177/009286150704100413 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_120 GBV_ILN_121 GBV_ILN_150 AR 41 2007 4 07 541-550 |
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10.1177/009286150704100413 doi (DE-627)SPR038917084 (SPR)009286150704100413-e DE-627 ger DE-627 rakwb eng Thompson, John R. verfasserin aut Enhanced Interpretation of Instrument Scales Using the Rasch Model 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Drug Information Association, Inc 2007 Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. Cappelleri, Joseph C. aut Getter, Christine aut Pleil, Andreas aut Reichel, Martin aut Wolf, Sebastian aut Enthalten in Therapeutic innovation & regulatory science [New York] : Springer Nature, 2013 41(2007), 4 vom: Juli, Seite 541-550 (DE-627)739896415 (DE-600)2708397-4 2168-4804 nnns volume:41 year:2007 number:4 month:07 pages:541-550 https://dx.doi.org/10.1177/009286150704100413 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_120 GBV_ILN_121 GBV_ILN_150 AR 41 2007 4 07 541-550 |
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Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. © Drug Information Association, Inc 2007 |
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Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. © Drug Information Association, Inc 2007 |
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Abstract Objectives: To enhance the interpretability of instrument scales in general and the National Eye Institute Visual Function Questionnaire in particular. Methods: The Rasch model was applied to the German version of the 39-item National Eye Institute Visual Function Questionnaire in patients with age-related macular degeneration. Two important sub-scales, near vision and distance vision, were used in this work. The likelihood of performing a task with little or no difficulty was selected as an indicator of a patient’s quality of life. Each possible subscale score was related to the likelihood of performing each task constituting the subscale with little or no difficulty. Results: The Rasch rating scale model was found to fit both subscales based on acceptable infit mean squares, a wide range of item difficulties, and monotonically increasing thresholds. Rasch category characteristic curves for each item in the subscale were back-transformed to the original scale of measurement and placed on a single graph. The graph provides a depiction of the relative difficulty of tasks, the probability of an individual performing a task without difficulty, and the expected mean performance of a group of individuals based on a subscale score. Results could be extended to access the impact of an intervention on the visual quality of life. Conclusions: This approach provides enhanced meaning to a subscale score while permitting the quantification of the improvement in the quality of life resulting from an intervention. © Drug Information Association, Inc 2007 |
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Enhanced Interpretation of Instrument Scales Using the Rasch Model |
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Cappelleri, Joseph C. Getter, Christine Pleil, Andreas Reichel, Martin Wolf, Sebastian |
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