By George J. Knafl,Kai Ding
This booklet offers equipment for investigating even if relationships are linear or nonlinear and for adaptively becoming acceptable types once they are nonlinear. facts analysts will how you can contain nonlinearity in a single or extra predictor variables into regression types for various forms of final result variables. Such nonlinear dependence is frequently now not thought of in utilized study, but nonlinear relationships are universal and so must be addressed. a typical linear research can produce deceptive conclusions, whereas a nonlinear research promises novel insights into information, no longer another way possible.
A number of examples of some great benefits of modeling nonlinear relationships are provided in the course of the ebook. tools are coated utilizing what are known as fractional polynomials in response to real-valued strength variations of fundamental predictor variables mixed with version choice in keeping with probability cross-validation. The ebook covers the right way to formulate and behavior such adaptive fractional polynomial modeling within the normal, logistic, and Poisson regression contexts with non-stop, discrete, and counts results, respectively, both univariate or multivariate. The booklet additionally offers a comparability of adaptive modeling to generalized additive modeling (GAM) and a number of adaptive regression splines (MARS) for univariate results.
The authors have created personalized SAS macros to be used in accomplishing adaptive regression modeling. those macros and code for carrying out the analyses mentioned within the e-book can be found during the first author's site and on-line through the book’s Springer web site. particular descriptions of the way to exploit those macros and interpret their output look through the e-book. those tools may be applied utilizing different programs.
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Adaptive Regression for Modeling Nonlinear Relationships (Statistics for Biology and Health) by George J. Knafl,Kai Ding