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My own opinion - I think it's more like riding a bike, once you feel what is to ride the bike, then you are able to do it and it comes much more naturally. I think the brain-grapher just got me to focus and concentrate on that more efficiently; like instead of reading a high-level text book to...

I've got the neurosky one, it was $100. The games that came with it were kind of simple and silly. I found the control seemed random, and practice didn't help much, which I'm sure is more my brain than the device. It measures 4 kinds of brain waves, and then "attention" and "relaxation" factors...

This is old news. The Onion covered this trend a couple of years ago: <iframe name="embedded" allowfullscreen webkitallowfullscreen mozallowfullscreen frameborder="no" width="480" height="270" scrolling="no" src="http://www.theonion.com/video_embed/?id=202"></iframe><br /><a...

Hi Jack, once I posted something and you responded, but it was deleted within 30 minutes. If possible, I hope I could hear a description again because I don't quite remember it. It was something I found as a byproduct, which reminded you of a project you worked on years ago. Some more...

I bought the machine and video card new 3 years, 2 months ago. The machine is HP, and I bought a better video card separately and put it in myself. I found the noise -- it is the fan on the video card (NVidia GeForce 9400 GT). Stopping that fan stopped the noise. Also, the CPU and chassis fans...

The temperatures are getting down low enough I'm getting the whine again. The next morning it happens, I'll start with checking the fans to figure out which one it is.

To add how they put it in the course, it helps figure out how diversified you portfolio is when you have many holdings on at one time. If everything is perfectly correlated, there is no diversification, and it's very high risk because they all move in the same direction at the same time. The...

Thanks, I didn't think about the fraud aspect. I suppose it's just best to ensure everything is up to date.

Every so often I get a letter asking me to verify or update the info the broker has on me regarding investment objective, income level, net worth, employment, etc. This is per SEC Rule 17a-3(a)(17). How important is this record, is it more for the broker or for the account holder? Can an account...

self study on coursera -- https://www.coursera.org/course/compfinance the one on computational finance and econometrics. It was really good for covering probability, some statistics, some linear algebra to work up to portfolio optimization and the efficient frontier. Includes R with full...

Thanks, I think I see your point, one is too small vs the whole series is too big. This leads me to think I should get an estimate how many bars my trades usually are, and use that number of bars for measuring a correlation estimate; ex, average trade = 30 bars, so split the whole series into an...

Just occurred to me -- the correlation of the differences do not allow for lag; if asset 2 lags asset 1, the correlation of the differences will be low. But using the cumsums, the correlation will remain if there is a lag between the 2. I did this with a single asset against itself. With the...

Which is better for correlations between price differences vs cumulative sum? In a course I took they covered efficient portfolios and optimization. A part of that was getting covariance and correlation matrices, and they used simple and logarithmic returns. Instead of price returns, I'd like to...

I read somewhere most public controls (like elevator door close, crosswalk signals, building thermostats) don't do anything, because the random control from so many people would be very expensive and inefficient. Engineers just put them there to give people an illusion of control, or else they...

I read, All Linux systems have python installed as part of the "distro", so it should be on there. Open console, type "python --version", or just python to start it up. The problem I had, I have Ubuntu 10.4, with Python 2.6.5, and they recommend 2.7 or 2.8 or higher for the QSTK package. Before...

Ha ha -- actually, I've found when studying on my own spare time as a hobby, it is actually quite enjoyable. I am so sad when I look back on earlier schooling in high school and university. I wonder, how much more I could have learned, and enjoyed the learning process, if I hadn't been bothered...

Doesn't sound like the same one, it was Professor Peng from Johns Hopkins University. You might still be able to enroll, but it ends this week. It's pretty good, he has sample assignments with a few expected outcomes, so you can check yourself, then a script that will do a couple more tests on...

I took Computing for Data Analysis, it's an introductory course to R. It was really good. over 4 weeks, the professor did a great job of presenting some of the basics and things you'd want to do in R. They always say R has a steep learning curve, so I've always put it off. But this course got me...

I am really excited for this course. I've taken the intro course in R (Computing for Data Analysis https://www.coursera.org/course/compdata), and continuing the one for Econometrics (Computational Finance and Econometrics https://www.coursera.org/course/compfinance). I have really learned a...

What about shifting part-timers to be 1099 contractors? I've heard of places that don't hire people as part-time, but as 1099 contractors. I think they treat them virtually the same as part-time. I don't think they can collect Unemployment if laid off (or contract terminated), so do they get...