How Long Are You In Marsoc For

DIMENSIONAL CLASSICAL RELIABILITY THEORY

Funny always hear "the reliability of the test is ...";" this test has a reliability ... " and similar phrases. The problem is that it comes to reliability as a characteristic of the instrument itself, as an intrinsic quality, and perhaps ultimately the same.

Nothing could be further from the truth. When we speak of reliability, this refers to a property of scores observed. It is a relationship between true variance and variance of observed scores, which is affected by many factors external to the test itself. They can therefore have many uses coefficients of reliability as we give the scores derived from a measurement tool.

Let us refer to the issue properly, "the reliability of scores is ..."


Best regards Andrés

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