Patrick Royston – författare
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2 produkter
2 produkter
Del 790 - Wiley Series in Probability and Statistics
Multivariable Model - Building
A Pragmatic Approach to Regression Anaylsis based on Fractional Polynomials for Modelling Continuous Variables
Inbunden, Engelska, 2008
1 443 kr
Skickas inom 5-8 vardagar
Multivariable regression models are of fundamental importance in all areas of science in which empirical data must be analyzed. This book proposes a systematic approach to building such models based on standard principles of statistical modeling. The main emphasis is on the fractional polynomial method for modeling the influence of continuous variables in a multivariable context, a topic for which there is no standard approach. Existing options range from very simple step functions to highly complex adaptive methods such as multivariate splines with many knots and penalisation. This new approach, developed in part by the authors over the last decade, is a compromise which promotes interpretable, comprehensible and transportable models.
1 074 kr
Skickas inom 10-15 vardagar
Through real-world case studies, this book shows how to use Stata to estimate a class of flexible parametric survival models. It discusses the modeling of time-dependent and continuous covariates and looks at how relative survival can be used to measure mortality associated with a particular disease when the cause of death has not been recorded. The book describes simple quantification of differences between any two covariate patterns through calculation of time-dependent hazard ratios, hazard differences, and survival differences.