Determination of Functional Relationships for Continuous Variables by Using a Multivariable Fractional Polynomial Approach. - Willi Sauerbrei; Patrick Royston (ISMDA, 2002)

Multivariable regression model building by using fractional polynomials: Description of SAS, STATA and R programs. - Willi Sauerbrei; Carolina Meier-Hirmer; Axel Benner; Patrick Royston (Comput. Stat. Data Anal., 2006)

Improving the robustness of fractional polynomial models by preliminary covariate transformation: A pragmatic approach. - Patrick Royston; Willi Sauerbrei (Comput. Stat. Data Anal., 2007)

Detecting an interaction between treatment and a continuous covariate: A comparison of two approaches. - Willi Sauerbrei; Patrick Royston; Karina Zapien Arreola (Comput. Stat. Data Anal., 2007)

Avoiding bias due to perfect prediction in multiple imputation of incomplete categorical variables. - Ian R. White; Rhian M. Daniel; Patrick Royston (Comput. Stat. Data Anal., 2010)

Multivariable Fractional Polynomial Models. - Willi Sauerbrei; Patrick Royston (International Encyclopedia of Statistical Science, 2011)