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Making Social Sciences More ScientificThe Need for Predictive Models$
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Rein Taagepera

Print publication date: 2008

Print ISBN-13: 9780199534661

Published to Oxford Scholarship Online: September 2008

DOI: 10.1093/acprof:oso/9780199534661.001.0001

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Geometric Means and Lognormal Distributions

Geometric Means and Lognormal Distributions

Chapter:
(p.120) 9 Geometric Means and Lognormal Distributions
Source:
Making Social Sciences More Scientific
Author(s):

Rein Taagepera (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199534661.003.0009

Geometric means are often more meaningful than arithmetic means, because they are closer to the central figure (median). When x and y can conceptually take only positive values, their distributions cannot be normal and may be lognormal. When running a normal distribution yields a standard deviation larger than one-half of the mean, one should dump the normal fit and try a lognormal fit instead.

Keywords:   arithmetic means, geometric means, lognormal distribution, median, normal distribution

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