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- W4313598536 abstract "The projection predictive variable selection is a decision-theoretically justified Bayesian variable selection approach achieving an outstanding trade-off between predictive performance and sparsity. Its projection problem is not easy to solve in general because it is based on the Kullback-Leibler divergence from a restricted posterior predictive distribution of the so-called reference model to the parameter-conditional predictive distribution of a candidate model. Previous work showed how this projection problem can be solved for response families employed in generalized linear models and how an approximate latent-space approach can be used for many other response families. Here, we present an exact projection method for all response families with discrete and finite support, called the augmented-data projection. A simulation study for an ordinal response family shows that the proposed method performs better than or similarly to the previously proposed approximate latent-space projection. The cost of the slightly better performance of the augmented-data projection is a substantial increase in runtime. Thus, in such cases, we recommend the latent projection in the early phase of a model-building workflow and the augmented-data projection for final results. The ordinal response family from our simulation study is supported by both projection methods, but we also include a real-world cancer subtyping example with a nominal response family, a case that is not supported by the latent projection." @default.
- W4313598536 created "2023-01-06" @default.
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- W4313598536 date "2023-01-04" @default.
- W4313598536 modified "2023-09-30" @default.
- W4313598536 title "Projection predictive variable selection for discrete response families with finite support" @default.
- W4313598536 doi "https://doi.org/10.48550/arxiv.2301.01660" @default.
- W4313598536 hasPublicationYear "2023" @default.
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