Some applications of the bootstrap in Spanish Discards Sampling Scheme
Herein we propose a nested boostrap scheme to explore di erent sources of variability in discard data. The proposed tool resamples on trips, hauls within trips and lengthclasess within hauls to include all sources of variability identified in the Spanish DCR sampling program scheme. Megrim (Lepidorh...
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ftcsic:oai:digital.csic.es:10261/327770 2024-02-11T10:06:25+01:00 Some applications of the bootstrap in Spanish Discards Sampling Scheme Santos-Blanco, Juan Carbonell, Ana Pérez-Contreras, María Nélida Copenhaguen (Denmark) Atlantic Ocean North Atlantic Northeast Atlantic ICES 2011 http://hdl.handle.net/10508/3652 http://hdl.handle.net/10261/327770 unknown Centro Oceanográfico de Vigo Study Group on Practical Implementation of Discard Sampling Plans. (27/06/2011 - 01/07/2011. Copenhague (Dinamarca)). 2011. http://hdl.handle.net/10508/3652 http://hdl.handle.net/10261/327770 3953 open Pesquerías Centro Oceanográfico de Vigo working paper 2011 ftcsic 2024-01-16T11:49:05Z Herein we propose a nested boostrap scheme to explore di erent sources of variability in discard data. The proposed tool resamples on trips, hauls within trips and lengthclasess within hauls to include all sources of variability identified in the Spanish DCR sampling program scheme. Megrim (Lepidorhombus wiffiagonis) and Hake (Merluccius merluccius) discard data collected in 2008 from OTB-51 metier operating in ICES Division VI - VII, and Mediterranea DEF-Southern metier operating in the GSA 6S area were considered as case studies. Bootstrap Error and Coeficients of Variation associated to mean discards per trip were obtained and compared with asymptotic estimates. Furthermore, we use the bootstrap to quantify the contribution of the given sources of variability to global variability, and to assess simulated sampling scenarios differing each others in sampling effort. The last application of this method is for detecting outliers in 2008 sampled units (Trips). The good performance of the bootstrap method validates its use to obtain reliable error estimates in further regression and/or classiffication studies on discard data. Report North Atlantic Northeast Atlantic Digital.CSIC (Spanish National Research Council) Hake ENVELOPE(15.612,15.612,66.797,66.797) |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Pesquerías Centro Oceanográfico de Vigo |
spellingShingle |
Pesquerías Centro Oceanográfico de Vigo Santos-Blanco, Juan Carbonell, Ana Pérez-Contreras, María Nélida Some applications of the bootstrap in Spanish Discards Sampling Scheme |
topic_facet |
Pesquerías Centro Oceanográfico de Vigo |
description |
Herein we propose a nested boostrap scheme to explore di erent sources of variability in discard data. The proposed tool resamples on trips, hauls within trips and lengthclasess within hauls to include all sources of variability identified in the Spanish DCR sampling program scheme. Megrim (Lepidorhombus wiffiagonis) and Hake (Merluccius merluccius) discard data collected in 2008 from OTB-51 metier operating in ICES Division VI - VII, and Mediterranea DEF-Southern metier operating in the GSA 6S area were considered as case studies. Bootstrap Error and Coeficients of Variation associated to mean discards per trip were obtained and compared with asymptotic estimates. Furthermore, we use the bootstrap to quantify the contribution of the given sources of variability to global variability, and to assess simulated sampling scenarios differing each others in sampling effort. The last application of this method is for detecting outliers in 2008 sampled units (Trips). The good performance of the bootstrap method validates its use to obtain reliable error estimates in further regression and/or classiffication studies on discard data. |
format |
Report |
author |
Santos-Blanco, Juan Carbonell, Ana Pérez-Contreras, María Nélida |
author_facet |
Santos-Blanco, Juan Carbonell, Ana Pérez-Contreras, María Nélida |
author_sort |
Santos-Blanco, Juan |
title |
Some applications of the bootstrap in Spanish Discards Sampling Scheme |
title_short |
Some applications of the bootstrap in Spanish Discards Sampling Scheme |
title_full |
Some applications of the bootstrap in Spanish Discards Sampling Scheme |
title_fullStr |
Some applications of the bootstrap in Spanish Discards Sampling Scheme |
title_full_unstemmed |
Some applications of the bootstrap in Spanish Discards Sampling Scheme |
title_sort |
some applications of the bootstrap in spanish discards sampling scheme |
publishDate |
2011 |
url |
http://hdl.handle.net/10508/3652 http://hdl.handle.net/10261/327770 |
op_coverage |
Copenhaguen (Denmark) Atlantic Ocean North Atlantic Northeast Atlantic ICES |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Hake |
geographic_facet |
Hake |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
Centro Oceanográfico de Vigo Study Group on Practical Implementation of Discard Sampling Plans. (27/06/2011 - 01/07/2011. Copenhague (Dinamarca)). 2011. http://hdl.handle.net/10508/3652 http://hdl.handle.net/10261/327770 3953 |
op_rights |
open |
_version_ |
1790604134874873856 |