Function to aggregate data by year
Data.frame with columns: Year, Length (in cm), and CatchNo
A data.frame with columns Length and Freq
R. Froese, H. Winker, G. Coro, N. Demirel, A.C. Tsikliras, D. Dimarchopoulou, G. Scarcella, W.N. Probst, M. Dureuil, and D. Pauly (2018) A new approach for estimating stock status from length frequency data. ICES Journal of Marine Science. DOI: 10.1093/icesjms/fsy078
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