Statistical inference about the relative efficiency of a new survey protocol, based on paired-tow survey calibration data
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Date
2010
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Show full item recordAbstract
Paired-tow calibration studies provide information onchanges in survey catchability that may occur because of some necessary change in protocols (e.g., change in vessel or vessel gear) in a fish stock survey. This information is important to ensure the continuity of annual time-series of survey indices of stock size that provide the basis for fishstock assessments. There are several statistical models used to analyze the paired-catch data from calibrationstudies. Our main contributions are results from simulation experiments designed to measure the accuracy of statistical inferences derived from some of these models. Our resultsshow that a model commonly used to analyze calibration data can provide unreliable statistical results when there is between-tow spatial variation in the stock densities at eachpaired-tow site. However, a generalized linear mixed-effects model gave very reliable results over a wide range of spatial variations in densities and we recommend it for the analysis of paired-tow survey calibration data. This conclusion also applies if there is between-tow variation incatchability.Journal
Fishery BulletinVolume
108Issue/Article Nr
1Page Range
15-29Resource/Dataset Location
http://fishbull.noaa.gov/1081/cadigan.pdfCollections