Quote from Sailing:
Credit Spread Traders vs. SET
Just wanted to say thanks for keeping the update updated.
I added an absolute difference column, and then calculated the MEAN of both. Interesting find... very helpful for those last few holding days into expiration. Let me explain.
The AVERAGE of the SET Diff was -.76, of which someone may interpret as "there tends to be little change from Thursdays close until Fridays open.... ie. little effect". As traders, we're not concerned with the 'average' as much as we are the 'actual movement' from the close, which in this case is the MEAN of the Absolute Difference.
The Mean of the Absolute Difference turned out to be 6.28, which would better represent our expected movement upon close from Thursday to open on Friday. As credit spread traders we're concerned about the absolute movement because our positions are risk based on the movement. We really don't know the direction, so it's the magnitude of the movement which is relative for us... especially going into the last day of expiration.
Therefore, based on the data presented in the spreadsheet, we should expect around 68% of the time the closing PRICE to be +/- 9pts. from Thursday's close, but we should expect an average movement of atleast 6.2pts.
I sure hope I haven't confused everyone now.... just thought this might help some of you determine your adjustment ranges and panic holding tactics for your credit spreads.
For Diagonal Traders.... you can throw this away!
Murray