Description Details Author(s) References
The cuttlefish.model package was developed to provide a software application of the two-stage biomass model to assess the English Channel cuttlefish stock. Functions enable, first, the standardization of the Landings Per Unit Effort (LPUE) using the delta-GLM method. Then, 4 abundance indices, 2 derived from surveys and 2 derived from standardized LPUE, and total landings (by all gears) are used as input data to fit a two-stage biomass model and estimate the recruited biomass and the catchability of each abundance index time series.
Package: | cuttlefish.model |
Type: | Package |
Version: | 1.0 |
Date: | 2013-12-13 |
License: | GPL |
LazyLoad: | yes |
Three functions and two datasets are provided in the cuttlefish.model package. First, the delta.glm function enables the LPUE standardization using the Delta-GLM method. An exemple using generated data stored in fr.data.lpue illustrates how to use this function. Then, the two.stage.model.fit function enables the fitting of the two-stage biomass model and provides an estimation of the recruited biomass on the one hand and of the 4 catchability coefficients on the other hand. An exemple using generated data stored in input.data illustrates how to fit the model. Finally, the two.stage.model.outputs function enables the estimation of the two-stage biomass model outputs using the recruited biomass and catchability estimations.
Michael Gras and Jean-Paul Robin
Maintainer: Michael Gras <michael.gras@ymail.com>
Gras, M., Roel, B. A., Coppin, F., Foucher, E. and Robin, J.-P. (2014). A two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock. Submitted to ICES Journal of Marine Science.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.