LinearRegressionByClass: Linear regression by class

In quicklizard99/cheddar: Analysis and Visualisation of Ecological Communities

Linear regression by class

Description

Fit linear regressions to node data by class.

Usage

LinearRegressionByClass(community, X, Y, class)

Arguments

community	an object of class Community.
X	Independent variable. A property name that must meet the criteria of the properties parameter of NPS.
Y	Dependent variable. A property name that must meet the criteria of the properties parameter of NPS.
class	The property over which linear regressions are fitted.

Details

A linear model is fitted through all data points and through each subset of the data given by class. A list of lm objects is returned. The list will contain NULL if it is not possible to fit a linear regression to that class; this will happen for classes that contain just a single node or that contain all or all but one nodes where X and/or Y is NA.

Value

A list of lm objects.

Author(s)

Lawrence Hudson

See Also

Community, ApplyByClass, NPS, NvMLinearRegressions, lm

Examples

data(TL84)

# Regressions fitted to log10(Biomass) versus log10(M) data.
models <- LinearRegressionByClass(TL84, 'Log10M', 'Log10Biomass', 
                                  'category')

# 'all', 'producer', 'invertebrate', 'vert.ecto'
names(models)

# Extract slopes and intercepts
sapply(models, coef)

quicklizard99/cheddar documentation built on Aug. 25, 2022, 5:01 a.m.