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Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests
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| Zeitschriftentitel: | American Journal of Speech-Language Pathology |
|---|---|
| Personen und Körperschaften: | , , |
| In: | American Journal of Speech-Language Pathology, 21, 2012, 2 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Speech Language Hearing Association
|
| Schlagwörter: |
| author_facet |
Hula, William D. Fergadiotis, Gerasimos Martin, Nadine Hula, William D. Fergadiotis, Gerasimos Martin, Nadine |
|---|---|
| author |
Hula, William D. Fergadiotis, Gerasimos Martin, Nadine |
| spellingShingle |
Hula, William D. Fergadiotis, Gerasimos Martin, Nadine American Journal of Speech-Language Pathology Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests Speech and Hearing Linguistics and Language Developmental and Educational Psychology Otorhinolaryngology |
| author_sort |
hula, william d. |
| spelling |
Hula, William D. Fergadiotis, Gerasimos Martin, Nadine 1058-0360 1558-9110 American Speech Language Hearing Association Speech and Hearing Linguistics and Language Developmental and Educational Psychology Otorhinolaryngology http://dx.doi.org/10.1044/1058-0360(2011/11-0090) <jats:sec> <jats:title>Purpose</jats:title> <jats:p>The purpose of this study was to identify the most appropriate item response theory (IRT) measurement model for aphasia tests requiring 2-choice responses and to determine whether small samples are adequate for estimating such models.</jats:p> </jats:sec> <jats:sec> <jats:title>Method</jats:title> <jats:p>Pyramids and Palm Trees (Howard & Patterson, 1992) test data that had been collected from individuals with aphasia were analyzed, and the resulting item and person estimates were used to develop simulated test data for 3 sample size conditions. The simulated data were analyzed using a standard 1-parameter logistic (1-PL) model and 3 models that accounted for the influence of guessing: augmented 1-PL and 2-PL models and a 3-PL model. The model estimates obtained from the simulated data were compared to their known true values.</jats:p> </jats:sec> <jats:sec> <jats:title>Results</jats:title> <jats:p>With small and medium sample sizes, an augmented 1-PL model was the most accurate at recovering the known item and person parameters; however, no model performed well at any sample size. Follow-up simulations confirmed that the large influence of guessing and the extreme easiness of the items contributed substantially to the poor estimation of item difficulty and person ability.</jats:p> </jats:sec> <jats:sec> <jats:title>Conclusion</jats:title> <jats:p>Incorporating the assumption of guessing into IRT models improves parameter estimation accuracy, even for small samples. However, caution should be exercised in interpreting scores obtained from easy 2-choice tests, regardless of whether IRT modeling or percentage correct scoring is used.</jats:p> </jats:sec> Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests American Journal of Speech-Language Pathology |
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10.1044/1058-0360(2011/11-0090) |
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Allgemeines Allgemeine und vergleichende Sprach- und Literaturwissenschaft, Indogermanistik, Außereuropäische Sprachen und Literaturen Biologie Psychologie Medizin |
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American Journal of Speech-Language Pathology |
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| title |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_unstemmed |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_full |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_fullStr |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_full_unstemmed |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_short |
Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_sort |
model choice and sample size in item response theory analysis of aphasia tests |
| topic |
Speech and Hearing Linguistics and Language Developmental and Educational Psychology Otorhinolaryngology |
| url |
http://dx.doi.org/10.1044/1058-0360(2011/11-0090) |
| publishDate |
2012 |
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| description |
<jats:sec>
<jats:title>Purpose</jats:title>
<jats:p>The purpose of this study was to identify the most appropriate item response theory (IRT) measurement model for aphasia tests requiring 2-choice responses and to determine whether small samples are adequate for estimating such models.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Method</jats:title>
<jats:p>Pyramids and Palm Trees (Howard & Patterson, 1992) test data that had been collected from individuals with aphasia were analyzed, and the resulting item and person estimates were used to develop simulated test data for 3 sample size conditions. The simulated data were analyzed using a standard 1-parameter logistic (1-PL) model and 3 models that accounted for the influence of guessing: augmented 1-PL and 2-PL models and a 3-PL model. The model estimates obtained from the simulated data were compared to their known true values.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Results</jats:title>
<jats:p>With small and medium sample sizes, an augmented 1-PL model was the most accurate at recovering the known item and person parameters; however, no model performed well at any sample size. Follow-up simulations confirmed that the large influence of guessing and the extreme easiness of the items contributed substantially to the poor estimation of item difficulty and person ability.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Conclusion</jats:title>
<jats:p>Incorporating the assumption of guessing into IRT models improves parameter estimation accuracy, even for small samples. However, caution should be exercised in interpreting scores obtained from easy 2-choice tests, regardless of whether IRT modeling or percentage correct scoring is used.</jats:p>
</jats:sec> |
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| author | Hula, William D., Fergadiotis, Gerasimos, Martin, Nadine |
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| description | <jats:sec> <jats:title>Purpose</jats:title> <jats:p>The purpose of this study was to identify the most appropriate item response theory (IRT) measurement model for aphasia tests requiring 2-choice responses and to determine whether small samples are adequate for estimating such models.</jats:p> </jats:sec> <jats:sec> <jats:title>Method</jats:title> <jats:p>Pyramids and Palm Trees (Howard & Patterson, 1992) test data that had been collected from individuals with aphasia were analyzed, and the resulting item and person estimates were used to develop simulated test data for 3 sample size conditions. The simulated data were analyzed using a standard 1-parameter logistic (1-PL) model and 3 models that accounted for the influence of guessing: augmented 1-PL and 2-PL models and a 3-PL model. The model estimates obtained from the simulated data were compared to their known true values.</jats:p> </jats:sec> <jats:sec> <jats:title>Results</jats:title> <jats:p>With small and medium sample sizes, an augmented 1-PL model was the most accurate at recovering the known item and person parameters; however, no model performed well at any sample size. Follow-up simulations confirmed that the large influence of guessing and the extreme easiness of the items contributed substantially to the poor estimation of item difficulty and person ability.</jats:p> </jats:sec> <jats:sec> <jats:title>Conclusion</jats:title> <jats:p>Incorporating the assumption of guessing into IRT models improves parameter estimation accuracy, even for small samples. However, caution should be exercised in interpreting scores obtained from easy 2-choice tests, regardless of whether IRT modeling or percentage correct scoring is used.</jats:p> </jats:sec> |
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| imprint_str_mv | American Speech Language Hearing Association, 2012 |
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| spelling | Hula, William D. Fergadiotis, Gerasimos Martin, Nadine 1058-0360 1558-9110 American Speech Language Hearing Association Speech and Hearing Linguistics and Language Developmental and Educational Psychology Otorhinolaryngology http://dx.doi.org/10.1044/1058-0360(2011/11-0090) <jats:sec> <jats:title>Purpose</jats:title> <jats:p>The purpose of this study was to identify the most appropriate item response theory (IRT) measurement model for aphasia tests requiring 2-choice responses and to determine whether small samples are adequate for estimating such models.</jats:p> </jats:sec> <jats:sec> <jats:title>Method</jats:title> <jats:p>Pyramids and Palm Trees (Howard & Patterson, 1992) test data that had been collected from individuals with aphasia were analyzed, and the resulting item and person estimates were used to develop simulated test data for 3 sample size conditions. The simulated data were analyzed using a standard 1-parameter logistic (1-PL) model and 3 models that accounted for the influence of guessing: augmented 1-PL and 2-PL models and a 3-PL model. The model estimates obtained from the simulated data were compared to their known true values.</jats:p> </jats:sec> <jats:sec> <jats:title>Results</jats:title> <jats:p>With small and medium sample sizes, an augmented 1-PL model was the most accurate at recovering the known item and person parameters; however, no model performed well at any sample size. Follow-up simulations confirmed that the large influence of guessing and the extreme easiness of the items contributed substantially to the poor estimation of item difficulty and person ability.</jats:p> </jats:sec> <jats:sec> <jats:title>Conclusion</jats:title> <jats:p>Incorporating the assumption of guessing into IRT models improves parameter estimation accuracy, even for small samples. However, caution should be exercised in interpreting scores obtained from easy 2-choice tests, regardless of whether IRT modeling or percentage correct scoring is used.</jats:p> </jats:sec> Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests American Journal of Speech-Language Pathology |
| spellingShingle | Hula, William D., Fergadiotis, Gerasimos, Martin, Nadine, American Journal of Speech-Language Pathology, Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests, Speech and Hearing, Linguistics and Language, Developmental and Educational Psychology, Otorhinolaryngology |
| title | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_full | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_fullStr | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_full_unstemmed | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_short | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| title_sort | model choice and sample size in item response theory analysis of aphasia tests |
| title_unstemmed | Model Choice and Sample Size in Item Response Theory Analysis of Aphasia Tests |
| topic | Speech and Hearing, Linguistics and Language, Developmental and Educational Psychology, Otorhinolaryngology |
| url | http://dx.doi.org/10.1044/1058-0360(2011/11-0090) |