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ON THE KRUSKAL-WALLIS TEST
The article presents the Kruskal–Wallis test as a rank-based comparison for independent groups, emphasizing its assumptions, tied-rank correction, interpretation, and limitations. It provides a complete R example, Dunn pairwise comparisons with Holm adjustment, rank-based effect sizes, permutation and bootstrap methods, and guidance for accurate reporting.
SELECTING EXPLANATORY VARIABLES IN STATISTICAL MODELS
The article presents a rigorous framework for selecting explanatory variables, emphasizing that choices depend on scientific purpose, data, model family, and validation. An exhaustive analysis of 128 regressions using U.S. state data favors four predictors, achieving strong fit and an outer LOOCV RMSE of 0.793 years. Results remain conditional, not causal.
Marxist Philosophy of Science: The Newspaper — 2026-11-10
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