barley

Data from a paper by Arild Vold on response of barley to nitrogen fertilizer

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. 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) <doi:10.2134/agronj2012.0506>, a book chapter with similar material <doi:10.2134/appliedstatistics.2016.0003> 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'. 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.

Fernando Miguez

nlraa

Nonlinear Regression for Agricultural Applications

Jos<c3><a9> Pinheiro

Douglas Bates

R-core 

barley function

A data frame with 76 rows and 3 columns<dl class="dl-horizontal">
 <dt>year</dt><dd>Year when the trial was conducted (1970-1988).</dd>
 <dt>NF</dt><dd>Nitrogen fertilizer (g/m^2).</dd>
 <dt>yield</dt><dd>Grain yield of barley (g/m^2).</dd>
</dl>

Format

Data from a paper by Arild Vold on response of barley to nitrogen fertilizer — barley

A data frame with 76 rows and 3 columns<dl class='dl-horizontal'>
 <dt>year</dt><dd>Year when the trial was conducted (1970-1988).</dd>
 <dt>NF</dt><dd>Nitrogen fertilizer (g/m^2).</dd>
 <dt>yield</dt><dd>Grain yield of barley (g/m^2).</dd>
</dl>

barley: Data from a paper by Arild Vold on response of barley to nitrogen fertilizer

Description

Usage

Arguments

Format