Creating and Purifying an Observation Instrument Using the Generalizability Theory
Keywords:Generalizability Theory, observational instrument, observational methodology, reliability, homogeneity
The control of quality of data it is one of the most relevant aspects in observational researches. The Generalizability Theory (GT) provides a method of analysis that allows us to isolate the various sources of error measurement. At the same time, it helps us to determine the extent to which various factors can change and analyze the effect on the generalizability coefficient. In the work shown here, there are two studies aimed to creating and purifying an observation instrument, Observation Protocol in the Teaching Functions (Protocolo de Funciones Docentes, PROFUNDO, v1 and v2), for behavioral assessment which has been carried out by instructors in a social-affective out-of-school program. The reliability and homogeneity studies are carried out once the instrument has been created and purified. The reliability study will be done through the GT method taking both codes (c) and agents (a) as differential facets in. The generalization will be done through observers using a crossed multi-faceted design (A × O × C). In the homogeneity study the generalization facet will be done through codes using the same design that the reliability study.
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