Bitcoin is highly Volatile as a Crypto Currency, determination of its volatility for 2018 will depend on market traffic.  Many people have a reason for investing in Bitcoin, which is for the purpose of profit, that is they buy when the price is low,and  as soon as the price rises, they sell their Bitcoins so as to make profit from their investments,and also to be able to avoid  loss as a result of Volatility. The type of investments may be long or short term  investments. It is more profitable for long term investments.Also bad publicity about bitcoin by banks also contributes to its Volatility. The Volatility of Bitcoin cannot be determined or ascertain by predictions, but the volatility will allow new investors to be able to access the coin when the price is at the dip,and  investors also to hodl and also to have vast knowledge about bitcoin and its Volatility.