Statistical Methods in Finance 2021

June 27 to July 1, 2021, 2-8pm IST


Quadratic variation and quadratic roughness

By Purba Das
University of Oxford, UK

We study the concept of quadratic variation of a continuous path along a sequence of partitions and its dependence with respect to the choice of the partition sequence. We define the concept of quadratic roughness of a path along a partition sequence and show that, for Hólder-continuous paths satisfying this roughness condition, the quadratic variation along balanced partitions is invariant with respect to the choice of the partition sequence. Typical paths of Brownian motion are shown to satisfy this quadratic roughness property almost-surely along any partition with a required step size condition. Using these results we derive a formulation of Fóllmer's pathwise integration along paths with finite quadratic variation which is invariant with respect to the partition sequence.

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Call for Papers in Sankhya B: Special Issue on Recent Advances in Statistical Finance

The aim of this special issue is to feature research papers on theory, methodology, and applications of models and methods for recent advances in statistical finance. We encourage submissions presenting original works on statistical, computational, and mathematical approaches to modelling and analysis of financial data. Innovative applications and case studies in financial statistics are welcome, especially related to novel methodological challenges in the treatment of big data and high-frequency data.

This special issue will bring together contributions from practitioners and researchers working on different aspects of statistical methods in finance, with methodological interests encompassing, but not limited to, the following domains:

The motivating application areas could be: For More Detail ...

If you are a student and want your paper to be considered for student paper competition, then ask your supervisor to send a mail at, with a particular mention that you were the primary contributor and author of the paper by May 15, 2021.

You must submit your paper by May 15, 2021, to be considered for the competition. Mail your paper at

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