Letters

Slutsky effect does not seem to explain circaseptennial rhythm in ear growth

BMJ 1997; 315 doi: https://doi.org/10.1136/bmj.315.7103.313b (Published 02 August 1997) Cite this as: BMJ 1997;315:313
  1. Patrick Onghena, Associate professor in educational statisticsa,
  2. Jos Verhulst, Associated researcherb,
  3. Dean McKenzie, Statisticianc
  1. a Faculty of Psychology and Educational Sciences, Katholieke Universiteit Leuven, B-3000 Leuven, Belgium
  2. b Louis Bolk Institute, Driebergen, Netherlands
  3. c Monash University, Melbourne, Australia

    Editor—M J Campbell states that the circaseptennial rhythm in ear growth is probably due to the Slutsky effect.1 Slutsky found that the use of moving averages might induce cycles in purely random series.2 It is not clear how and to what extent this effect was relevant to our analysis and how it distorted the P value in Fisher's κ test. …

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