nlraa - 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)
<doi:10.1093/aob/mcg029>. 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. Twenty eight (28) 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)
<doi:10.2134/agronj2012.0506>, a book chapter with similar
material <doi:10.2134/appliedstatistics.2016.0003.c15> and a
publication by Oddi et. al. (2019) in Ecology and Evolution
<doi:10.1002/ece3.5543>. The function 'nlsLMList' uses 'nlsLM'
for fitting, but it is otherwise almost identical to
'nlme::nlsList'.In addition, this release of the package
provides functions for conducting simulations for 'nlme' and
'gnls' objects as well as bootstrapping. These functions are
intended to work with the modeling framework of the 'nlme'
package. It also provides four vignettes with extended
examples.
