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Expectancy = zero. But test it anyway. You will surely learn something. However if your stocks are very volatile and loosely correlated, you might be successful at pumping volatility out of them. Ninna

Well actually there is a fundamental law prohibiting it, which makes that whole "rightist" speech BS. How do you expect 100% of the people to be in that 1%?... And what do you do with the 99% that by definition can't make it? Let them die? And especially the poorest 1% (and again by...

What kind of operations? If you can perform it in parallel, the language isn't important. You need to distribute the work on as many machines as needed. You will need custom-made software to do that. Ninna

Excellent software. Simple to use, free, open-source, cross-platform, secure and flexible. I've used it for years. Highly recommended. Ninna

What seems like social injustice is actually simply am intrinsic characteristic from the capitalist system. You are certainly aware that wealth distribution in all capitalist systems is distributed as a power law. What do you think causes the fat tail? The fact that wealth attracts wealth...

What's your background? Ninna

Not necessarily. Statistical arbitrage goes beyond data-mining. :) Ninna

Fix or dynamic weights? For fix weights the risk of over-fitting is huge and I wouldn't trade it. For dynamic weights you can test the algorithm on different asset classes and come up with something quite robust. Actually, some algorithm even have theoretical guarantees. You can reach...

Sure. You consider your pf as a random variable. At the end of every trading period you get a realization. You then analyze the characteristics of the distribution of that random variable. If the distribution is stationary your strategy is robust. Ninna

Could you please point to some papers that you found interesting? Thanks Ninna

What's the fundamental reason that makes your strategy work? In other words, what market behaviour is your strategy based on? If you can't answer that question, you are most likely overfitting. (Quantitatively speaking, varying the parameters and checking for robustness should give you a...

A large part of what they do is exploiting dependencies in portfolios. It hasn't much to do with curve fitting. Ninna

You get what you pay for. For free you don't get much. We use fortinet and we are very happy with their products. However it is far from free. FW are useless agaisnt key-loggers as even the most basic ones use http tunneling. Ninna

Excellent post and very true. Howard, ToS probability of touching is good for entertainment. The number doesn't give you accurate PoT. The real distribution has much more kurtosis. Compute the difference between ToS PoT and the actual distribution around your strikes over 5 years. If the...

Job's vision is "my way or the highway". He never allowed his products to inter-connect with the "lesser beings" such as IBM, Microsoft and Google products. Apple always manages to come with the killer product that is a phenomenal success for a few years. And then the other brands collaborate...

He's a business genius, that's for sure. But Apple doesn't need the whole rollercoaster thing. Huge successes that then turn in failures. It happened with their computers, it's happening right now with the Ipods and the Apple Store, it is starting with the Iphone... the same schema just...

It would be great news for Apple! Without Jobs Apple might become the huge monster company it should have been. Ninna

Report him to the SEC. Pump and dump is illegal. Ninna

Why would they have anything to say in that deal? It's good news for BP. And bad news for Obama. Ninna

Oh please! You must be kidding. Don't you have anything more biased? Ninna