Exercise Treatment For Pectus Carinatum

X = V + e

observed scores (X) is a linear combination of the true scores (V) and error (e).

This is the classical linear model and classical theory Tests of the postulated in 1904 by Charles Spearman. For a long time the only measurement model that supported the psychometric processes (and edumétricos, although I really like this term), until the first expansion of Cronbach and others in the years 50 (Theory of Generali) and independent contributions Rasch Lord and in the years 60 (Item Response Theory and Rasch analysis).

Even now, despite its limitations, remains one of the models used in the study of psychometric and kind is inevitable in a good curriculum in a school of psychology.


Best regards Andrés