Nonlinear Regression for Agricultural Applications

Additional nonlinear regression functions using self-start (SS) algorithms. One of the functions is the Beta growth function proposed by Yin et al. (2003) . There are several other functions with breakpoints (e.g. linear-plateau, plateau-linear, exponential-plateau, plateau-exponential, quadratic-plateau, plateau-quadratic and bilinear), a non-rectangular hyperbola and a bell-shaped curve. Eighteen new self-start (SS) functions in total. This package also supports the publication 'Nonlinear regression Models and applications in agricultural research' by Archontoulis and Miguez (2015) , a book chapter with similar material and a publication by Oddi et. al. (2019) in Ecology and Evolution . The function 'nlsLMList' uses nlsLM for fitting, but it is otherwise almost identical to 'nlme::nlsList'. One of the main benefits is that these functions can be integrated in the modeling framework of the 'nlme' package. It also provides three vignettes with extended examples.


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0.53 by Fernando Miguez, 3 months ago

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Authors: Fernando Miguez [aut, cre] , José Pinheiro [ctb, cph] (author of nlme::nlsList) , Douglas Bates [ctb, cph] (author of nlme::nlsList) , R-core [ctb, cph]

Documentation:   PDF Manual  

GPL-3 license

Imports knitr, nlme, stats

Suggests bbmle, emmeans, ggplot2, HydroMe, lattice, minpack.lm, nlstools, nls2, segmented

See at CRAN