At first I guess rolling a future potion by volume should be reasonable. But I did a simple research shows maybe simply roll by volume maybe too early. VXQ17 expires around 8/17/2017. Using volume to roll cause the rolling happens at 2017-08-08, there's 8 days remaining,the front one is still active traded. The other way roll by calendar date maybe too late.
My intention is to maintain a short current VX future position. Is is possible to define a way to roll (roll after the second future's volume> first future's volume*1.1)? I need some suggestion,plz