Letter | Published:

Periodicities

Abstract

DR. WALKER'S note contains, I think, a valid and valuable criticism of the procedure commonly adopted hitherto in comparing individual intensities with the average intensity in harmonic analysis. It would lead me now to modify in several ways my general discussion of the “test of intensity” (pp. 422–424 of my paper in the Journal of the Royal Statistical Society. I was particularly careful, however, in that paper to avoid laying stress on intensity as such. The net result of Dr. Walker's calculations is not to weaken but to confirm my main thesis. that a number of real periodicities exist in European wheat prices from 1550 to 1850.

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