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BMC Medical Research Methodology|April 6, 2022
Investigating treatment-effect modification by a continuous covariate in IPD meta-analysis: an approach using fractional polynomialsWilli Sauerbrei, Patrick RoystonStatistics in Medicine|April 13, 2013
Interaction of treatment with a continuous variable: simulation study of significance level for several methods of analysisPatrick Royston, Willi SauerbreiStatistics in Medicine|August 3, 2004
A new approach to modelling interactions between treatment and continuous covariates in clinical trials by using fractional polynomialsPatrick Royston, Willi SauerbreiStatistics in Medicine|September 29, 2011
A new strategy for meta-analysis of continuous covariates in observational studiesWilli Sauerbrei, Patrick RoystonStatistics in Medicine|September 23, 2014
Interaction of treatment with a continuous variable: simulation study of power for several methods of analysisPatrick Royston, Willi SauerbreiStatistics in Medicine|February 26, 2004
A new measure of prognostic separation in survival dataPatrick Royston, Willi SauerbreiThe Stata Journal|February 6, 2018
mfpa: Extension of mfp using the ACD covariate transformation for enhanced parametric multivariable modelingPatrick Royston, Willi SauerbreiStatistics in Medicine|July 4, 2007
Modelling to extract more information from clinical trials data: On some roles for the bootstrapWilli Sauerbrei, Patrick RoystonStatistics in Medicine|October 5, 2012
Comparison between splines and fractional polynomials for multivariable model building with continuous covariates: a simulation study with continuous responseHarald Binder, Willi Sauerbrei, Patrick RoystonStatistics in Medicine|December 7, 2007
Selection of important variables and determination of functional form for continuous predictors in multivariable model buildingWilli Sauerbrei, Patrick Royston, Harald BinderPageof 14