A standard wavelet power spectrum analysis of daily cryptocurrency and macro prices finds qualitative high-frequency 'hot spots' and a claimed XRP periodicity line, but provides no formal evidence for cyclical persistence or weak-form market inefficiency.
Goodell, Stephane Goutte, 'Co-movement of COVID-19 and Bitcoin: Evidence from wavelet coherence analysis', Finance Research Letters, 38 (2021)
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Wavelet Analysis of Cryptocurrencies -- Non-Linear Dynamics in High Frequency Domains
A standard wavelet power spectrum analysis of daily cryptocurrency and macro prices finds qualitative high-frequency 'hot spots' and a claimed XRP periodicity line, but provides no formal evidence for cyclical persistence or weak-form market inefficiency.