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LEDESMA, Rubén; IBANEZ, Gabriel Molina  and  MORA, Pedro Valero. Internal consistency analysis by means of Cronbach’s Alpha: a computer program based on dynamic graphics. PsicoUSF [online]. 2002, vol.7, n.2, pp. 143-152. ISSN 1413-8271.

This paper describes a computer software that provides dynamic graphics to perform internal consistence analysis by means of Cronbach’s Alpha. This software, based on Exploratory Data Analysis philosophy and statistical visualization methods, is designed to assist the process of psychological test and scale construction. It allows carry out internal consistency analysis, as well as exploring statistical properties of items, subject responses patterns, and the effect of item deletion and test length increase on reliability coefficient. Comparing with other statistical software, the benefit of this program is to use dynamic graphics complementing statistical output.

Keywords : Cronbach’s Alpha; Statistical visualization; Dynamic graphics.

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