Polychoric/Tetrachoric Matrix or Pearson Matrix? A methodological study. by Dominguez Lara, Sergio Alexis

“…The use of product-moment correlation of Pearson is common in most studies in factor analysis in psychology, but it is known that this statistic is only applicable when the variables related are in interval scale and normally distributed, and when are used in ordinal data may to produce a distorted correlation matrix . …”
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Polytomous or dichotomous items? an empirical study with an unidimensional scale by Dominguez Lara, Sergio Alexis

“…Likert scales from its apparition and diffusion have been well received and are considered one of the best methods to build psychological testing. Furthermore, it is assumed than if have more response options, you will have more information about the individual, and better psychometric properties. …”
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