A test for symmetry with leptokurtic financial data

Gamini Premaratne, Anil K. Bera

Research output: Contribution to journalArticle

Abstract

Most of the tests for symmetry are developed under the (implicit or explicit) null hypothesis of normal distribution. As is well known, many financial data exhibit fat tails, and therefore commonly used tests for symmetry (such as the standard √b1 test based on sample skewness) are not valid for testing the symmetry of leptokurtic financial data. In particular, the √b1 test uses third moment, which may not be robust in presence of gross outliers. In this article we propose a simple test for symmetry based on the Pearson type IV family of distributions, which take account of leptokurtosis explicitly. Our test is based on a function that is bounded over the real line, and we expect it to be more well behaved than the test based on sample skewness (third moment). Results from our Monte Carlo study reveal that the suggested test performs very well in finite samples both in terms of size and power. Simulation results also support our conjecture of the tests to be well behaved and robust to excess kurtosis. We apply the test to some selected individual stock return data to illustrate its usefulness.

Original languageEnglish (US)
Pages (from-to)169-187
Number of pages19
JournalJournal of Financial Econometrics
Volume3
Issue number2
DOIs
StatePublished - Jan 1 2005

Keywords

  • Function
  • Kurtosis
  • Monte Carlo study
  • Pearson family of distributions
  • Rao's score test
  • skewness

ASJC Scopus subject areas

  • Finance
  • Economics and Econometrics

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