dataBin: The 'IBTS_data' amended with explicit length and body mass...

In andrew-edwards/sizeSpectra: Fitting Size Spectra to Ecological Data Using Maximum Likelihood

The IBTS_data amended with explicit length and body mass ranges for each bin for using the MLEbins method

Description

The IBTS_data amended with explicit length and body mass ranges for each bin for using the MLEbins method

Usage

dataBin

Format

Dataframe where each of 42,298 rows is a unique combination of Year, SpecCode and LngtMin. Columns are:

• Year: Year of survey

• SpecCode: Species code

• LngtMin: The minimum value (cm) of each length bin, same as LngtClass in IBTS_data.

• LngtMax: The maximum value (cm) of each length bin, taking into account that all bin widths are 1 cm except for Atlantic Herring and European Sprat that are 0.5 cm.

• LWa: Length-weight coefficient \alpha from Fung et al. (2012) for that species, as per our MEPS equation (1).

• LWb: Length-weight coefficient \beta from Fung et al. (2012) for that species, as per our MEPS equation (1).

• wmin: The minimum value (g) of each body-mass bin, based on the species-specific length-weight coefficients and LngtMin.

• wmax: The maximum value (g) of each body-mass bin, based on the species-specific length-weight coefficients and LngtMax.

• Number: Number of individuals per hour of trawling observed for that combination of Year, SpecCode and LngtMin.

Source

From amending IBTS_data as per vignette MEPS_IBTS_MLEbins.

andrew-edwards/sizeSpectra documentation built on June 28, 2023, 7:09 p.m.