swpg

Simulated data based on obseved data presented in Sinclair (1986) - Fig. 1A

datasets

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.

Fernando Miguez

nlraa

Nonlinear Regression for Agricultural Applications

José Pinheiro

Douglas Bates

R-core 

swpg function

A data frame with 20 rows and 3 columns<dl>
 <dt>ftsw</dt>
<dd>Fraction of Transpirable Soil Water (0-1)</dd> <dt>lfgr</dt>
<dd>Relative Leaf Growth scaled from 0 to 1</dd>
</dl>

Format

Water limitations for Soybean growth — swpg

A data frame with 20 rows and 3 columns<dl>
 <dt>ftsw</dt>
<dd>Fraction of Transpirable Soil Water (0-1)</dd>

 <dt>lfgr</dt>
<dd>Relative Leaf Growth scaled from 0 to 1</dd>


</dl>

swpg: Water limitations for Soybean growth

Description

Usage

Arguments

Format

Details