Abstract

LOSADA, José Luis  and  LEIVA, David. Study on the quality of an observation instrument. CPD [online]. 2016, vol.16, n.1, pp.43-50. ISSN 1989-5879.

The construction of a good instrument of observation in the field of observational methodology is important in order to validate the hypotheses of the study. The objective of this study is to present a procedure to know the quality of an instrument. Using as reference a design of follow-up, nomotetic, multidimensional, and an instrument of observation (category system) built to record the offensive plays in a football game. The statistical technique of logistic regression, in this case, is used to predict the success/no success of played offensive, as explained variable, which according to some predictor variables will determine the degree of adaptation of the instrument of observation to the situation to study. Checks are not good predictors of offensive transitions through the Cox - Snell and Nagelkerke R².

Keywords : Observational methodology; a system of categories; logistic regression; football; offensive transitions.

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