Measuring the reliability of picture story exercises like the TAT.

As frequently reported, psychometric assessments on Picture Story Exercises, especially variations of the Thematic Apperception Test, mostly reveal inadequate scores for internal consistency. We demonstrate that the reason for this apparent shortcoming is not caused by the coding system itself but f...

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Autores principales:	Nicole Gruber, Ludwig Kreuzpointner
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0e6da55afab84417b3798506f55e2ab3
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id	oai:doaj.org-article:0e6da55afab84417b3798506f55e2ab3
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spelling	oai:doaj.org-article:0e6da55afab84417b3798506f55e2ab32021-11-18T08:48:12ZMeasuring the reliability of picture story exercises like the TAT.1932-620310.1371/journal.pone.0079450https://doaj.org/article/0e6da55afab84417b3798506f55e2ab32013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24348902/?tool=EBIhttps://doaj.org/toc/1932-6203As frequently reported, psychometric assessments on Picture Story Exercises, especially variations of the Thematic Apperception Test, mostly reveal inadequate scores for internal consistency. We demonstrate that the reason for this apparent shortcoming is not caused by the coding system itself but from the incorrect use of internal consistency coefficients, especially Cronbach's α. This problem could be eliminated by using the category-scores as items instead of the picture-scores. In addition to a theoretical explanation we prove mathematically why the use of category-scores produces an adequate internal consistency estimation and examine our idea empirically with the origin data set of the Thematic Apperception Test by Heckhausen and two additional data sets. We found generally higher values when using the category-scores as items instead of picture-scores. From an empirical and theoretical point of view, the estimated reliability is also superior to each category within a picture as item measuring. When comparing our suggestion with a multifaceted Rasch-model we provide evidence that our procedure better fits the underlying principles of PSE.Nicole GruberLudwig KreuzpointnerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 11, p e79450 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nicole Gruber Ludwig Kreuzpointner Measuring the reliability of picture story exercises like the TAT.
description	As frequently reported, psychometric assessments on Picture Story Exercises, especially variations of the Thematic Apperception Test, mostly reveal inadequate scores for internal consistency. We demonstrate that the reason for this apparent shortcoming is not caused by the coding system itself but from the incorrect use of internal consistency coefficients, especially Cronbach's α. This problem could be eliminated by using the category-scores as items instead of the picture-scores. In addition to a theoretical explanation we prove mathematically why the use of category-scores produces an adequate internal consistency estimation and examine our idea empirically with the origin data set of the Thematic Apperception Test by Heckhausen and two additional data sets. We found generally higher values when using the category-scores as items instead of picture-scores. From an empirical and theoretical point of view, the estimated reliability is also superior to each category within a picture as item measuring. When comparing our suggestion with a multifaceted Rasch-model we provide evidence that our procedure better fits the underlying principles of PSE.
format	article
author	Nicole Gruber Ludwig Kreuzpointner
author_facet	Nicole Gruber Ludwig Kreuzpointner
author_sort	Nicole Gruber
title	Measuring the reliability of picture story exercises like the TAT.
title_short	Measuring the reliability of picture story exercises like the TAT.
title_full	Measuring the reliability of picture story exercises like the TAT.
title_fullStr	Measuring the reliability of picture story exercises like the TAT.
title_full_unstemmed	Measuring the reliability of picture story exercises like the TAT.
title_sort	measuring the reliability of picture story exercises like the tat.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/0e6da55afab84417b3798506f55e2ab3
work_keys_str_mv	AT nicolegruber measuringthereliabilityofpicturestoryexerciseslikethetat AT ludwigkreuzpointner measuringthereliabilityofpicturestoryexerciseslikethetat
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Measuring the reliability of picture story exercises like the TAT.

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