To the Top Vertical Spread . An option spread strategy in which the options have different strikes, but the same expiration dates . To the Top Volatility . A measure of the amount by which an underlying is expected to fluctuate in a given period of time. Volatility is a primary determinant in the valuation of options premiums and time value .
Implied volatility is calculated by using an option pricing model.
Historical volatility is calculated by using the standard deviation of an underlying stock price. To the Top Zeta .