6. Vega value
Vega value shows the change in the value of the option for a one percent increase in implied volatility. This value is always positive. Near the money, the option has a higher vega value compared to in the money and out of the money option. Option, which has a longer time to expiry, has a higher vega value than the option, which has a shorter time to expiry. Since vega value measures the sensitivity of the option to the change of the security volatility, higher vega value options are more preferable for purchase than those with low vega value.