For those of you that have a trading strategy or have read of one and are curious to work it out without putting real money into it - you might be interested in marketocracy.com - HG Pennysmackers here on Elite told me about it.
It simulates the market and trading fees (although its simulation is not a personal collection of stocks - but is instead a simulation of being a fund manager - so there are a lot of compliance rules you have to follow that are more strict that real life rules) - and it is the best I have seen for free on the web.
CollegiateLifter - I didn't say anything about the impossibility of multi-sigma events - just the low probability.
There is a big difference.
Many of the issues with the probability theory is whether you are treating the standard deviation as one over a normal Guassian curve - which is an inappropriate thing for application against the stock market since it won't deviate into the negative (if you are looking at the change in value, then it is more acceptable, but if you are looking at prices, they can't go negative, they just delist).
When you don't apply it to the proper curve (I'm blanking on the proper curve term name at the moment - I want to say lepto something, but without looking it up I am sure I am wrong on that) - then you have a more accurate spread - but still can never be totally on with the predictions of the next sigma event.
That said, the stock market has fairly regular event periods and you can show that there is some given probability that gets increasingly more likely to happen with each day that goes by and it hasn't happened.
But that falls more into risk than uncertainty.
I love talking about this stuff, but if you think it is all voodoo, then it is wasted on you and you are welcome to feel that way. I personally am interested in a job at a hedge fund, so I am trying to learn all that I can to get in there - if you have no desire to do that sort of thing, then it is probably useless for you and would look like nonsense.
(and to be fair, there is a ton of nonsensical theories out there - I only personally go with the ones that are based in math and physics and have proofs in those fields)
Tia373 - if the guy is only willing to make money and not lose money, then he is completely in denial of how the system works.
Just looking at the Gambler's Ruin against an unbiased random series will already prove that wrong... although I guess that one could argue that it isn't entirely applicable in this case since the stock market has an overall bias upward since inception.
I trade for a friend right now, but just for the sake of doing it right now - no charge. Largely because if I can get the hedge fund position, I'm not sure that I can legally be paid by others to deal with their money.
I am also about to start the process of getting my CFA - that takes some time though. I would prefer to do it at an institution so that I could have the challenge of getting the highest score there, but if I can do it on my own and increase my hirability, then just as well.
I enjoy all of it and enjoy talking about it - but anything with religion, money, or government (which are all the same in the end) will quickly devolve into name calling and personal issues, so it is a risky endeavor to talk about it with people that share different views - and it is boring at best to discuss it with people that have the same views.