A Critical Investigation of Cryptocurrency Data and Analysis

22 Pages Posted: 13 May 2019

See all articles by Carol Alexander

Carol Alexander

University of Sussex Business School

Michael Dakos

University of Sussex Business School

Date Written: May 4, 2019

Abstract

Market betas of bitcoin relative to a broad crypto market index vary considerably, depending on the data source and the index selected. Even greater differences are found for ether and other cryptocurrencies. An in-depth exploration of the cause of these discrepancies reveals a long-standing incorrect time-stamping of some ranking-site data, and hence also the CRIX market index. Furthermore, individual coin data from some exchanges requires adjusting for unstable prices in the 'stablecoin' tether. Even then, since Bitfinex starting trading the tether-dollar cross on margin their coin prices have de-coupled from prices on other exchanges. Is yet another Bitfinex-tether issue arising? Finally, regarding the risk analysis of coin returns, we argue that this requires highly sophisticated models. But calibrating even the simplest GARCH model is extremely difficult because they are surprisingly sensitive to the data source.

Keywords: Cryptocurrency, Market Beta, Markov Switching GARCH, Price Data, Volatility

JEL Classification: C22, C5, E42, F31, G1, G2

Suggested Citation

Alexander, Carol and Dakos, Michael, A Critical Investigation of Cryptocurrency Data and Analysis (May 4, 2019). Available at SSRN: https://ssrn.com/abstract=3382828 or http://dx.doi.org/10.2139/ssrn.3382828

Carol Alexander (Contact Author)

University of Sussex Business School ( email )

Falmer, Brighton BN1 9SL
United Kingdom

HOME PAGE: http://www.carolalexander.org

Michael Dakos

University of Sussex Business School ( email )

Falmer, Brighton BN1 9SL
United Kingdom

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