{"refrec":{"BRefID":37947,"RR":"<b>Fryer, R.J.; Zuur, A.F.; Graham, N.</b> (2003). Using mixed models to combine smooth size-selection and catch-comparison curves over hauls. <i>Can. J. Fish. Aquat. Sci. 60(4)</i>: 448-459","BEntID":37947,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Can. J. Fish. Aquat. Sci. 60(4)</i>: 448-459","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fryer, R.J.; Zuur, A.F.; Graham, N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fryer, R.J. <i>et al.</i>","Englishabstract":"Parametric size-selection curves are often combined over hauls to estimate a mean selection curve using a mixed model in which between-haul variation in selection is treated as a random effect. This paper shows how the mixed model can be extended to estimate a mean selection curve when smooth nonparametric size-selection curves are used. The method also estimates the between-haul variation in selection at each length and can model fixed effects in the form of the different levels of a categorical variable. Data obtained to estimate the size-selection of dab by a Nordmøre grid are used for illustration. The method can also be used to provide a length-based analysis of catch-comparison data, either to compare a test net with a standard net or to calibrate two research survey vessels. 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