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Factor analysis
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====Exploratory factor analysis==== {{broader|Exploratory factor analysis}} Exploratory factor analysis (EFA) is used to identify complex interrelationships among items and group items that are part of unified concepts.<ref name=Polit>{{cite book |author=Polit DF Beck CT |title=Nursing Research: Generating and Assessing Evidence for Nursing Practice, 9th ed. |year=2012 |publisher=Wolters Klower Health, Lippincott Williams & Wilkins |location=Philadelphia, USA}}</ref> The researcher makes no ''a priori'' assumptions about relationships among factors.<ref name=Polit/>
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