Abstract
WHEN we compare the catch of fish of one year with that of another, we find one greater or less than the other, and that seems at first sight the end of the matter. But if we analyse each year's total into its monthly parts we see in every case a certain seasonal periodicity; and it follows that we may expect to find not only differences of total quantity, but also of phase and amplitude, the two ways in which one periodic function differs from another. Let us reduce the monthly quantities to percentages of their annual totals, and then compare the periodicity of one year with another or with a mean. To show, briefly, how orderly and how instructive the rough market statistics are, let us merely compare one year's monthly data with another's:
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THOMPSON, D. Fishery Statistics. Nature 144, 445 (1939). https://doi.org/10.1038/144445a0
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DOI: https://doi.org/10.1038/144445a0
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