Z Scores, Standard Scores, and Composite Test Scores Explained

Patients may be assessed using a battery of tests where different tests yield scores in different units, where different tests have different minimum and maximum scores, and where higher or lower scores mean different things in different tests. Therefore, a composite test score cannot be obtained by...

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Autor principal:	Chittaranjan Andrade
Formato:	article
Lenguaje:	EN
Publicado:	SAGE Publishing 2021
Materias:	Psychiatry RC435-571
Acceso en línea:	https://doaj.org/article/862cc9ada1b4425ab21519205eedd868
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spelling	oai:doaj.org-article:862cc9ada1b4425ab21519205eedd8682021-11-18T23:34:42ZZ Scores, Standard Scores, and Composite Test Scores Explained0253-71760975-156410.1177/02537176211046525https://doaj.org/article/862cc9ada1b4425ab21519205eedd8682021-11-01T00:00:00Zhttps://doi.org/10.1177/02537176211046525https://doaj.org/toc/0253-7176https://doaj.org/toc/0975-1564Patients may be assessed using a battery of tests where different tests yield scores in different units, where different tests have different minimum and maximum scores, and where higher or lower scores mean different things in different tests. Therefore, a composite test score cannot be obtained by simple addition or averaging of scores in the individual tests. However, if performances in individual tests are converted to Z scores, the Z scores can be added or averaged to yield a composite score that can be interpreted or processed using conventional statistical methods. This article explains in simple ways how Z scores are calculated, what the properties of Z scores are, how Z scores can be interpreted, and how Z scores can be converted into other standard scores.Chittaranjan AndradeSAGE PublishingarticlePsychiatryRC435-571ENIndian Journal of Psychological Medicine, Vol 43 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Psychiatry RC435-571
spellingShingle	Psychiatry RC435-571 Chittaranjan Andrade Z Scores, Standard Scores, and Composite Test Scores Explained
description	Patients may be assessed using a battery of tests where different tests yield scores in different units, where different tests have different minimum and maximum scores, and where higher or lower scores mean different things in different tests. Therefore, a composite test score cannot be obtained by simple addition or averaging of scores in the individual tests. However, if performances in individual tests are converted to Z scores, the Z scores can be added or averaged to yield a composite score that can be interpreted or processed using conventional statistical methods. This article explains in simple ways how Z scores are calculated, what the properties of Z scores are, how Z scores can be interpreted, and how Z scores can be converted into other standard scores.
format	article
author	Chittaranjan Andrade
author_facet	Chittaranjan Andrade
author_sort	Chittaranjan Andrade
title	Z Scores, Standard Scores, and Composite Test Scores Explained
title_short	Z Scores, Standard Scores, and Composite Test Scores Explained
title_full	Z Scores, Standard Scores, and Composite Test Scores Explained
title_fullStr	Z Scores, Standard Scores, and Composite Test Scores Explained
title_full_unstemmed	Z Scores, Standard Scores, and Composite Test Scores Explained
title_sort	z scores, standard scores, and composite test scores explained
publisher	SAGE Publishing
publishDate	2021
url	https://doaj.org/article/862cc9ada1b4425ab21519205eedd868
work_keys_str_mv	AT chittaranjanandrade zscoresstandardscoresandcompositetestscoresexplained
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Z Scores, Standard Scores, and Composite Test Scores Explained

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