preyFAs: Prey fatty acid signatures. Each prey signature is a row with...

Description Usage Format Details

Description

The prey file should contain all of the individual fatty acid signatures of the prey and their lipid contents (where appropriate) - a matrix of the mean values for the FAs (prey.matrix) by the designated prey modelling group is then calculated using the MEANmeth function.

Usage

1

Format

A data frame with 302 observations and 70 variables:

Lab.Code

TODO

Species

TODO

lipid

TODO

c12.0
c13.0
Iso14
c14.0
c14.1w9
c14.1w7
c14.1w5
Iso15
Anti15
c15.0
c15.1w8
c15.1w6
Iso16
c16.0
c16.1w11
c16.1w9
c16.1w7
c7Me16.0
c16.1w5
c16.2w6
Iso17
c16.2w4
c16.3w6
c17.0
c16.3w4
c17.1
c16.3w1
c16.4w3
c16.4w1
c18.0
c18.1w13
c18.1w11
c18.1w9
c18.1w7
c18.1w5
c18.2d5.11
c18.2w7
c18.2w6
c18.2w4
c18.3w6
c18.3w4
c18.3w3
c18.3w1
c18.4w3
c18.4w1
c20.0
c20.1w11
c20.1w9
c20.1w7
c20.2w9
c20.2w6
c20.3w6
c20.4w6
c20.3w3
c20.4w3
c20.5w3
c22.1w11
c22.1w9
c22.1w7
c22.2w6
c21.5w3
c22.4w6
c22.5w6
c22.4w3
c22.5w3
c22.6w3
c24.1w9

Details

Like the predator .csv file you can have as many tombstone data columns as required but there must be at least one column that identifies the modelling group, in this case, Species.

Unlike the predator data, the prey data is not subsetted and renomalized during the modelling so the prey file needs to be subsetted for the desired fatty acid set and renormalized to sum to 1 prior to calculating the mean values.

The full FA set is extracted from the data frame (columns 4 onward), subsetted for the FA set in use and then renormalized over 1. The modelling group names (the "Species" column in this case) is then added back to the subsetted and renormalized data (as the first column) and the average values calculated using the MEANmeth function. Note that for the MEANmeth function to work the modelling group name must be in the first column.


QFASA documentation built on June 15, 2019, 1:03 a.m.