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A Simple Method to Visualize Results in Nonlinear Regression Models
gradient estimation dimensionality kernel smoothing nonlinear mean plots least squares cross validation
2012/10/23
A simple graphical approach to presenting results from nonlinear regression models is described. In the face of multiple covariates, 'partial mean' plots may be unattractive. The approach here is port...
Perturbation analysis of nonlinear matrix population models
age averages barnacles density-dependence dependency ratios elasticity homeostasis immigration matrix calculus matrix population models population cycles sensitivity Tribolium two-sex models
2008/12/16
Perturbation analysis examines the response of a model to changes in its parameters. It is commonly applied to population growth rates calculated from linear models, but there has been no general appr...
Quadratic spline fits by nonlinear least squares
fertility fertility models quadratic splines software
2008/12/9
This web program fits a Quadratic Spline model, as described in Schmertmann (2003; Demographic Research Volume 9, Article 5), to any empirical fertility schedule supplied by the user. The fit minimize...
Complexity Theory, Nonlinear Dynamics, and Change: Augmenting Systems Theory
Complexity nonlinear dynamics systems
2008/10/7
Social work change processes are addressed in terms of complexity theory and nonlinear dynamics, adding the edge-of-chaos, as well as chaos to the entropy and homeostasis of ecosystems theory. Complex...
