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Flexible\nfunctional forms are supported using natural cubic splines\n('splines'), B-splines ('splines'), and GAM smooths ('mgcv').\nSupports two-way and nested clustering via 'lme4', automatic\nknot selection by AIC or BIC, multilevel R-squared\ndecomposition (Nakagawa-Schielzeth marginal and conditional\nR-squared with level-specific variance partitioning), a\npostestimation suite returning first and second derivatives\nwith confidence bands, turning points and inflection regions,\nand a model comparison workflow contrasting linear, polynomial,\nand spline fits by AIC, BIC, and likelihood-ratio tests.\nCluster heterogeneity in nonlinear effects is supported via\nrandom-slope spline terms.", "License": "GPL-3", "Encoding": "UTF-8", "Language": "en-US", "URL": "https://github.com/causalfragility-lab/MultiSpline", "BugReports": "https://github.com/causalfragility-lab/MultiSpline/issues", "Roxygen": "list(markdown = TRUE)", "RoxygenNote": "7.3.3", "Config/pak/sysreqs": "cmake make", 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