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- W5198720 abstract "A significant aspect of data modeling with categorical predictors is the definition of a saturated model. In fact, there are different ways of specifying it—the casewise, the contingency table, and the collapsing approaches—and they strictly depend on the unit of analysis considered. The analytical units of reference could be the subjects or, alternatively, groups of subjects that have the same covariate pattern. In the first case, the goal is to predict the probability of success (failure) for each individual; in the second case, the goal is to predict the proportion of successes (failures) in each group. The analytical unit adopted does not affect the estimation process; however, it does affect the definition of a saturated model. Consequently, measures and tests of goodness of fit can lead to different results and interpretations. Thus one must carefully consider which approach to choose. In this article, we focus on the deviance test for logistic regression models. However, the results and the conclusions are easily applicable to other linear models involving categorical regressors. We show how Stata 12.1 performs when implementing goodness of fit. In this situation, it is important to clarify which one of the three approaches is implemented as default. Furthermore, a prominent role is played by the shape of the dataset considered (individual format or events–trials format) in accordance with the analytical unit choice. In fact, the same procedure applied to different data structures leads to different approaches to a saturated model. Thus one must attend to practical and theoretical statistical issues to avoid inappropriate analyses." @default.
- W5198720 created "2016-06-24" @default.
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- W5198720 date "2013-07-01" @default.
- W5198720 modified "2023-10-02" @default.
- W5198720 title "Goodness-of-Fit Tests for Categorical Data" @default.
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- W5198720 doi "https://doi.org/10.1177/1536867x1301300210" @default.
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