posnegRichards.calls: List of calls for fitting 33 SSposnegRichards models in...

In FlexParamCurve: Tools to Fit Flexible Parametric Curves

List of calls for fitting 33 SSposnegRichards models in nlsList

Description

The posnegRichards.calls list has two components of 17 and 16 rows and 1 column, respectively, called 'Examples of calls for FlexParamCurve models that estimate parameter m' (models with 4 estimable first curve parameters) and "Examples of calls for FlexParamCurve models that fix parameter m" (models with 3 estimable second curve parameters, i.e. M is fixed to value in pnmodelparams. Individual calls can be accessed by indexing first the component number and then the model number - see examples below. Note that model 17 is formulated differently (see SSposnegRichards)

Usage

posnegRichards.calls

Format

This object of class list containing the components:

Examples of calls for FlexParamCurve models that estimate parameter m

a list of 16 possible reductions (nos. 1-16) of the FlexParamCurve double-Richards model that estimate parameter m. Also includes a custom model (17; see SSposnegRichards).

Examples of calls for FlexParamCurve models that fix parameter m

a list of 16 possible reductions (nos. 21-36) of the FlexParamCurve double-Richards model that do not estimate parameter m but instead fix it to a mean across the dataset or user-specified value.

Details

A list object to provide users with examples of how to fit 33 different nlsList models using the selfStart function SSposnegRichards.

Examples

# see all possible calls
posnegRichards.calls
# extract the call for fitting a nls model with 8-parameter double-Richards curve (model 1)
#for an example just fit a subset of the data, 3 group levels (individuals)
   data <- subset(posneg.data, as.numeric(row.names (posneg.data) ) < 40)
modtofit <- as.character( 
               posnegRichards.calls [[2]] [row.names(posnegRichards.calls [[2]]) == "22",] )
#change the data source
modtofit <- sub("posneg.data","data",modtofit)
modtofit <- parse(text = modtofit)
#create list for fixed parameters
modpar(posneg.data$age, posneg.data$mass, pn.options = "myoptions")
#create a new nlsList object called richards22.lis
eval(modtofit)
#view object
richardsR22.lis

# view call for model 1
posnegRichards.calls [[1]] [row.names(posnegRichards.calls [[1]]) == "1",]

# view call for model 21
posnegRichards.calls [[2]] [row.names(posnegRichards.calls [[2]]) == "21",]

FlexParamCurve documentation built on May 29, 2024, 6:48 a.m.