When the price of Bitcoin fell, other cryptocurrencies like Ethereum, Cardano, and Dogecoin all dropped by over 15%. What has been the pattern of price correlation among them in historical data? Has this correlation strengthened or weakened in the current market environment, and what are the reasons?

The correlation among cryptocurrencies like Ethereum, Cardano, and Dogecoin has historically been strong. However, recent market volatility may have weakened this correlation due to individual factors influencing each coin's price movement.