For volatility use the beta. It's not exact but close enough. The actual volatility calculation is complex and the cost/benefit is not there if you don't have a volatility calculator. For example, beta for 3/31/15 is 210% when the actual volatility is 220%. The difference between the two is the volatility for the warrants is calculated using a 5 year lookback period. This means it's calculated using the past 5 years worth of stock information given that there are 5 years left to expiration.
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