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The distribution of individual fluctuating asymmetry: why are the coefficients of variation of the unsigned FA so high?


, : The distribution of individual fluctuating asymmetry: why are the coefficients of variation of the unsigned FA so high?. Annales Zoologici Fennici. 30 September; 352: 79-85

It has been established for a long time that rigorous statistical analyses of fluctuating asymmetry (FA) requires great caution. The reason for this is twofold. Firstly, the magnitude of FA is often small and measurement error (ME) may substantially bias asymmetry estimates, and secondly, there are other forms of asymmetry that are sometimes difficult to distinguish from real FA. To avoid bias due to ME, within-subject repeats and mixed model analysis are required. The model assumptions, however, are that both FA and ME are normally distributed. In this paper I show that in many cases these assumptions are not met. In particular, available data in the literature and these presented here suggests that FA (signed) often has a leptokurtic distribution, as indicated by relative high coefficients of variation of the absolute value of the signed FA. This may be due to patterns of antisymmetry and/or heterogeneity of FA within the sample.

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Harris, S., 1996: Biological phosphorus removal from waste water. Official Gazette of the United States Patent & Trademark Office Patents 1189(1): 330-331, Aug 6

Noll, D.C., 1991: Deming, quality and the small medical group administrator. As administrators, writes Douglas Noll, we can coordinate and implement quality measures affecting our practices and which impact the patient's total medical experience. Unfortunately, many smaller groups cannot hire an outside consultant or...

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Doroshenko, V.A.; Smirnov, V.A., 1971: Detection of weak EEG reactions to acoustic stimulation by a narrow-band filtration method. Nervnaia Sistema 12: 146-149

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Randall D.C.; Smith O.A., 1971: Heart rate pressure and myo cardial contractility responses to exercise and emotional conditioning in the nonhuman primate. Physiologist 14(3): 213

Coussement, W.H.orens, A.; Ducatelle, R.B.rghen, P.G.eraerts, J., 1981: Diarrhoea in suckling piglets associated with Eimeria neodebliecki. Eimeria neodebliecki, suckling piglets, diarrhea, histologic and electron microscopic examination

Fenchel, T., 1982: Ecology of heterotrophic micro flagellates 3. adaptations to heterogeneous environments. The response to starvation and to feeding after a period of starvation was studied in heterotrophic microflagellates. Starvation immediately leads to a decrease in metabolic rate which eventually falls to 2-5% of that characteristic for growing ce...

Lou, S.; Westbrook, J.A.; Schaus, S.E., 2004: Decarboxylative aldol reactions of allyl beta-keto esters via heterobimetallic catalysis. Mild and selective heterobimetallic-catalyzed decarboxylative aldol reactions involving allyl beta-keto esters have been developed. The reaction is promoted by Pd(0)- and Yb(III)-DIOP complexes at room temperature and involves the in situ formatio...

Monceviciūte-Eringiene, E., 2000: Cancer as a specific variant of the evolutionary resistance of adapted cells to damaging factors. Voprosy Onkologii 46(3): 255-262