Coach:
I know that you typically use 10 to 15 points (distance between short strike and SPX price) as a trigger to consider adjusting.
In July after the London bombing I used 15 points to adjust and after the slingshot rebound my adjusted down bear call got into subsantial trouble. If I had used 10 points (esp. since there was only one week left) instead, my positions would have expired and I would have been profitable.
This month I again adjusted when the SPX got within about 10 points or so of my short strike. If I had used 5 points instead (as you and others did), I wouldn't have had to adjust and would have been more profitable.
The July experience, in particular, left me with the impression that as you get near ATM, the cost of getting out of a spread increases dramatically. Andy Smith has pointed out that it may not be as bad as I think, and the data he presented makes sense and is making me question my trigger strategy.
So what I would like to do is to plot theoretical values of credit spreads as a function of time to expiration, distance of short strike to SPX, volatility and maybe whether a 10 or 15 point spread was used. I'm hoping this might help refine the point (i.e. the distance between the short strike and the SPX price) at which adjustments should be considered as a function particularly of time to expiration and volatility (of course other factors will be involved in determining if an actual adjustment should be undertaken).
Before I do this, I wanted to get your advice and see if you had any suggestions; i.e. other factors to consider; how to present the results, etc. If people are interested in viewing the results, I'll post to the forum.
I know that you typically use 10 to 15 points (distance between short strike and SPX price) as a trigger to consider adjusting.
In July after the London bombing I used 15 points to adjust and after the slingshot rebound my adjusted down bear call got into subsantial trouble. If I had used 10 points (esp. since there was only one week left) instead, my positions would have expired and I would have been profitable.
This month I again adjusted when the SPX got within about 10 points or so of my short strike. If I had used 5 points instead (as you and others did), I wouldn't have had to adjust and would have been more profitable.
The July experience, in particular, left me with the impression that as you get near ATM, the cost of getting out of a spread increases dramatically. Andy Smith has pointed out that it may not be as bad as I think, and the data he presented makes sense and is making me question my trigger strategy.
So what I would like to do is to plot theoretical values of credit spreads as a function of time to expiration, distance of short strike to SPX, volatility and maybe whether a 10 or 15 point spread was used. I'm hoping this might help refine the point (i.e. the distance between the short strike and the SPX price) at which adjustments should be considered as a function particularly of time to expiration and volatility (of course other factors will be involved in determining if an actual adjustment should be undertaken).
Before I do this, I wanted to get your advice and see if you had any suggestions; i.e. other factors to consider; how to present the results, etc. If people are interested in viewing the results, I'll post to the forum.