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| Author: | Royston, P. Altman, D. |
| Title: | Regression using fractional polynomials of continuous covariates: parsimonious parametric modelling |
| Journal: | Applied Statistics
1994 : VOL. 43:3, p. 429-468 |
| Index terms: | MODELS POWER UNITED KINGDOM |
| Language: | eng |
| Abstract: | The relationship between a response variable and one or more continuous covariates is often curved. Attempts to represent curvature in single- or multiple-regression models are usually made by means of polynomials of the covariates, typically quadratics. However, low order polynomials offer a limited family of shapes, and high order polynomials may fit poorly at the extreme values of the covariates. The authors propose an extended family of curves called fractional polynomials. |
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