Quote from rfriend73:
Jeff.
What made you decide to trade SPY vs other ETFs and stocks ? Have you tried your model on other instruments ?
During one time or another in the past 10-12 years, I have tried the math trading formula's (before they were integrated into my current trading program completed in 2004-2005) on
OEX Index options, QQQ etf options, DJX options and SPY options.
A: Bid to Ask Spread:
To me, option trading is all about buying options with a
.01 or .02 cent bid to ask price. Any bigger then that and your just giving away your profits. Program Buy Limit, Sell Limit, & Stop formula's are very close most of the time and I can't afford sloppy
spreads.
B: High Daily Volume:
10,000 contracts or > on the strike your trading.
This help keep the bid to ask tight,
and makes the options easier to enter and exit. It also provides good low to high range activity.
C: Strikes every 1 point of index or etf value:
This way I can keep initial Delta consistent on all trades.
I don't want to start a one trade with a delta of .55 and another
with a delta of .30.
D: The formula's are good for an "average" move in the etf of
about 1 point = 25% gain on an ITM or slightly ITM SPY option.
(averages are derived from years of data in all market conditions; "but" delta, volatility & time premium create exceptions in both directions).
What I found I didn't like about the others (other than SPY) is:
OEX:
Bid to Ask Spread too Large.
Volume nearly non-existent.
ATM & ITM too expensive.
On paper the trades work. With real cash trades they don't.
QQQ:
It works with the Q's except I would most of the time, have to be willing to accept lower profit levels (and the bid to ask spread always seemed higher than the SPY).
DJX:
Bid to Ask Spread too large and volume too low.
SPY:
The best attributes of A,B, C & D above.
Jeff