LifeHist (version 1.0-1)

as.GroAgeData: Create a Data Object to Fit Individual Growth Models with Age-Length Observations

Description

From a data.frame identify columns with data on length and age from a single sex category, two sexes, or two sexes plus unsexed individuals, and optionally include date, body weight, liver weight, and gonad weight, to create a data object with a class attribute.

Usage

as.GroAgeData(x, sex, maleskey = NULL, femaleskey = NULL, colsex = NULL, colage, collen, colbw = NULL, colliver = NULL, colgonad = NULL, coldate = NULL, lentype, unitsage, unitslen, unitsbw = NULL, unitsliver = NULL, unitsgonad = NULL, spec)

Arguments

x

Data.frame containing the data, where each line is an individual.

sex

Character, either "Females", "Males", "Pooled", "Both", or "Total".

maleskey

Usually a numeric key indicating whether the individual is male.

femaleskey

Usually a numeric key indicating whether the individual is female.

colsex

Integer. The column in 'x' with the sex key.

colage

Integer. The column in 'x' with the age data.

collen

Integer. The column in 'x' with the length data.

colbw

Integer. Optionally, the column in 'x' with the body weight data.

colliver

Integer. Optionally, the column in 'x' with the liver weight data.

colgonad

Integer. Optionally, the column in 'x' with the gonad weight data.

coldate

Integer. Optionally, the column in 'x' with the collection date data.

lentype

Character. In the case of fish, this indicates whether the length is total, fork, or standard.

unitsage

Character. The units of age.

unitslen

Character. The units of length.

unitsbw

Character. Optionally, the units of body weight.

unitsliver

Character. Optionally, the units of liver weight.

unitsgonad

Character. Optionally, the units of gonad weight.

spec

Character. A species identification key.

Value

A list with class attribute 'GroAgeData' with the following components:

Properties

A data.frame with properties of the data, such as the species key, the type of sex, units of age, units of length, and the other optional properties

Sex 1

A data.frame with an individual key, the age, the length, and optionally other individual data

Sex 2

Optionally, the same as the previous component but for the other sex

Sex 3

Optionally, the same as the previous components but for the unsexed individuals

Details

When 'sex' is "Females" or "Males", the data.frame 'x' contains data for a single sex. When 'sex' is "Pooled" the sex has not been determined and both sexes might be mixed. When 'sex' is "Both" all individuals have been sexed. Finally, when 'sex' is 'Total' some individuals have been sexed but some have been not so there is a third sex category which implicitly corresponds to unsexed individuals. For instance this could happen with very young individuals for which their sex could not be determined.

Examples

data(ksbream)
KSBream.AgeLen <- as.GroAgeData(x=ksbream,
                                sex="Total",
                                maleskey=1,
                                femaleskey=2,
                                coldate=1,
                                colsex=9,
                                colage=11,
                                collen=2,
                                colbw=5,
                                colliver=7,
                                colgonad=8,
                                lentype="Total",
                                unitsage="Years",
                                unitslen="mm",
                                unitsbw="g",
                                unitsliver="g",
                                unitsgonad="g",
                                spec="KSBream")
plot(KSBream.AgeLen)