Description Usage Arguments Value References Examples
BackCalcLength
employs the Dahl-Lea algorithm to
back-calculate length at age given specific data from the analysis
of hard parts (e.g., scales). Assumes for now first age is 1.
1 | BackCalcLength(data, lCap, rCap, rAtAge)
|
data |
Dataframe where each row is a single fish & contains fields below. |
lCap |
Field name in data containing (numeric) length at capture. |
rCap |
Field name in data containing (numeric) scale radius at capture. |
rAtAge |
Field (column) names or column numbers (easier) in |
A dataframe with two numeric fields: len
& age
. NA
values have been removed.
Lea, E. 1910. On the methods used in the herring-investigations. Publ. Circonst. Cons. perm. int. Explor. Mer 108(1):14–22.
Ogle, D.H. 2016. Introductory Fisheries Analyses with R. Chapman & Hall/CRC, Boca Raton, FL.
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