Quantitative Fatty Acid Signature Analysis


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Documentation for package ‘QFASA’ version 1.0.2

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QFASA-package QFASA: A package for Quantitative Fatty Acid Signature Analysis
AIT.dist Returns the distance between two compositional vectors using Aitchison's distance measure.
AIT.more Used to provide additional information on various model components evaluated at the optimal solution i.e. using the QFASA diet estimates and Aitchison distance measure.
AIT.obj Used in 'solnp()' as the objective function to be minimized when Aitchison distance measure is chosen.
CC Fatty acid calibration coefficients.
chisq.dist Returns the distance between two compositional vectors using the chi-square distance.
CS.more Used to provide additional information on various model components evaluated at the optimal solution i.e. using the QFASA diet estimates and chi-square distance measure.
CS.obj Used in 'solnp()' as the objective function to be minimized when chi-square distance measure is chosen. Unlike AIT.obj and KL.obj, does not require modifying zeros.
FAset List of fatty acids to be used for modelling.
KL.dist Returns the distance between two compositional vectors using Kullback-Leibler distance measure.
KL.more Used to provide additional information on various model components evaluated at the optimal solution i.e. using the QFASA diet estimates and Kullback-Leibler distance measure.
KL.obj Used in 'solnp()' as the objective function to be minimized when Kullback-Leibler distance measure is chosen.
mean.geometric Returns the geometric mean of a compositional vector
MEANmeth Returns the multivariate mean FA signature of each prey group entered into the QFASA model. Result can be passed to prey.mat in 'p.QFASA()'.
multiplot Multiplot
p.QFASA Computes the diet estimate for each predator in seal.mat using either the Kullback-Leibler Distance (KL), the Aitchison Distance (AIT) or the Chi-Square Distance (CS).
predatorFAs Predator fatty acid signatures. Each predator signature is a row with fatty acid proportions in columns.
preyFAs Prey fatty acid signatures. Each prey signature is a row with fatty acid proportions in columns.
QFASA QFASA: A package for Quantitative Fatty Acid Signature Analysis
QFASA.const.eqn Returns 'sum(alpha)' and used in 'solnp'.