Nelson primarily invests in low cost index funds because “I can see history on that,” she says. The newness of cryptocurrency and lack of trackable data make her wary of these crazy swings.
In order to provide a methodology to detect bubbles in time series, Phillips, Wu, and Yu [23] proposed the supremum augmented Dickey-Fuller (SADF) test. This applies a series of right-tailed unit root tests to expanding windows of a time series (with a fixed start date), defined by where r2 is the final data point to be considered in each window, starting at r0 which is a fraction representing the smallest allowed window size and expanding to 1(the complete data set).

The cryptocurrencies prices are highly volatile compared with the traditional currency pairs and assets in the foreign exchange market due to fluctuations in the interest of the public. This factor is associated with the user and we must add the absence of current regulation and its constant pressure from governments. These factors make the volatility of the digital currencies constant, modifying the Cryptocurrencies Market Prices and affecting values of such cryptocurrencies as Bitcoin, Ethereum, Ripple, Cardano, Stellar Lumens, VeChain, Litecoin or Chainlink, among others.
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