Methods for comparing the means of two independent log-normal samples

Xiao Hua Zhou, Sujuan Gao, Siu L. Hui

Research output: Contribution to journalArticle

116 Scopus citations


Standard methods of using the t-test and the Wilcoxon test have deficiencies for comparing the means of two skewed log-normal samples. In this paper, we propose two new methods to overcome these deficiencies: (1) a likelihood-based approach and (2) a bootstrap-based approach. Our simulation study shows that the likelihood-based approach is the best in terms of the type I error rate and power when data follow a log-normal distribution.

Original languageEnglish (US)
Pages (from-to)1129-1135
Number of pages7
Issue number3
StatePublished - Sep 1 1997


  • Bootstrap
  • Cost data
  • Likelihood
  • Log-normal

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Public Health, Environmental and Occupational Health
  • Agricultural and Biological Sciences (miscellaneous)
  • Applied Mathematics
  • Statistics and Probability

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