Have been reading these posts with interest. Some thoughts:
I question whether a pre-market fair value calculation adds any significant edge when it comes to profitability of opening only trades. Does the specialist make a fair value calculaton before deciding where to open his (her) stock? (Are there any female specialists? I'll bet there are.) While I don't doubt he/she is keenly aware of pre-market futures levels, I presume he'll open his stock primarily based on the orders he sees on his book. Like he always does. If he's the EK specialist, and the globex futures closed 1% above fair value where will he open the stock? What if there's a 500,000 share seller up a dime from EK's close? If the total shares to buy are 75,000 shares, I'll bet he opens the stock under the big offer, shorting a chunk of stock at the same time with the intent of covering lower. Fair value in this case is irrelevant. Am I wrong?
Experience and research tells me that the main advantage to pre-market fair-value calculatons is to gauge how many of your opening only orders you might expect to fill. If futures are way up, it's logical to expect to be hit on a lot of shorts, so it you don't want that you should limit you exposue on the short side in some way.
When I backtested a portfolio of 25 liquid, thick, NYSE stocks over the last eight months, I had no simple way of calculating historical fair value, so I just skipped it. The results were consistently profitable. The only caveat was that on a few days, 20 of the 25 stocks filled. Days with many fills were overwhelmingly profitable, but trade management is an obvious issue.
Bottom line: The big edge to opening-only trading on NYSE stocks is in trading with the the specialist. The specialist opens the stock at a point where he/she will make the most $$. All other considerations--including fair-value--are secondary. Any thoughts?