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- W4297822847 abstract "Extending generalized estimating equations (GEE) to ordinal response data requires a conversion of the ordinal response to a vector of binary category indicators. That leads to a rather complicated association structure, and the introduction of large matrices when the number of categories and dimension of the cluster are large. To allow a richer specification of working correlation assumptions, we adopt the weighted scores method which is essentially an extension of the GEE approach, since it can also be applied to families that are not in the GLM class. The weighted scores method stems from the lack of a theoretically sound methodology for analyzing multivariate discrete data based only on moments up to second order and it is robust to dependence and nearly as efficient as maximum likelihood. There is no need to convert the ordinal response to binary indicators, thus the weight matrices have smaller dimensions and it is not necessary to guess the correlations of indicator variables for different categories. We focus on important issues that would interest the data analyst, such as choice of the structure of the correlation matrix and of explanatory variables, comparison of results obtained from our methods versus GEE, and insights provided by our method that would be missed with the GEE method. Our modelling framework is implemented in the package weightedScores within the open source statistical environment R." @default.
- W4297822847 created "2022-10-01" @default.
- W4297822847 creator A5051053502 @default.
- W4297822847 date "2015-10-26" @default.
- W4297822847 modified "2023-10-18" @default.
- W4297822847 title "Weighted scores method for longitudinal ordinal data" @default.
- W4297822847 doi "https://doi.org/10.48550/arxiv.1510.07376" @default.
- W4297822847 hasPublicationYear "2015" @default.
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