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A goodness-of-fit test for geometric Brownian motion

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  • Gaigall, Daniel
  • Wübbolding, Philipp

Abstract

A new goodness-of-fit test for the composite null hypothesis that data originate from a geometric Brownian motion is studied in the functional data setting. This is equivalent to testing if the data are from a scaled Brownian motion with linear drift. Critical values for the test are obtained, ensuring that the specified significance level is achieved in finite samples. The asymptotic behavior of the test statistic under the null distribution and alternatives is studied, and it is also demonstrated that the test is consistent. Furthermore, the proposed approach offers advantages in terms of fast and simple implementation. A comprehensive simulation study shows that the power of the new test compares favorably to that of existing methods. A key application is the assessment of financial time series for the suitability of the Black-Scholes model. Examples relating to various stock and interest rate time series are presented in order to illustrate the proposed test.

Suggested Citation

  • Gaigall, Daniel & Wübbolding, Philipp, 2025. "A goodness-of-fit test for geometric Brownian motion," Computational Statistics & Data Analysis, Elsevier, vol. 210(C).
    • Handle: RePEc:eee:csdana:v:210:y:2025:i:c:s0167947325000726
    DOI: 10.1016/j.csda.2025.108196
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    References listed on IDEAS

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