R Packages worth a look

Integral of B-Spline Functions (ibs)Calculate B-spline basis functions with a given set of knots and order, or a B-spline function with a given set of knots and order and set of de Boor p …

Cox Proportional Hazards Regression for Right Truncated Data (coxrt)Fits Cox regression based on retrospectively ascertained times-to-event. The method uses Inverse-Probability-Weighting estimating equations.

Display Information About Nested Subsets of a Data Frame (vtree)A tool for drawing ‘variable trees’. Variable trees display information about hierarchical subsets of a data frame defined by values of categorical var …

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