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Never spend a dime on 'educational materials' excluding possibly reasonably priced books, or on strategies/systems/expert advisors/robots/whatever; that will just further encourage a very unhealthy industry. Most stuff for sale has no significance/edge (i.e. gives you no better advantage than...

^Sure, but eventually there will be a DD to set it back a decade (and it's not given it will recover at the rate it ascended since inception). It's a great lottery ticket for sure, which probably fits the objective of some individuals. More seriously, something like 20% of portfolio in TQQQ and...

Simply don't hold w/ leverage waiting for trend to resume... 1x for counter trend trades on daily bars is harsh enough. IOW buy & hold of TQQQ shouldn't be a thing (but bet there are some people trying it).

Borrow fees can make it not quite as straightforward, but aside from that valid point.

Most common bugs (as per my experience): Lookahead bias (any hints about the future will generally be snapped up by machine learning algorithms to make "predictions". This can happen in very subtle ways. Failure to model slippage. A huge range of algorithms will appear profitable without...

I think it's fair to be harsh on hedge fund managers but collectively calling them parasites is a bit much, just IMHO. You have a choice to invest with a hedge fund or not. Of course, most people doing their research on historical data will arrive at the conclusion most hedge funds deliver no...

Oligopoly at work. Regulators need to side hard against exchanges in data matters.

Gonna be a very shaky ride though with many casualties.

Edit: Never mind, realized your post was a reply to the article link but I will let it stand. What's more likely to happen with PDT is (speaking out of personal experience a number of years ago) over-committing a large proportion of one's capital into the brokerage account rather than...

Gief meh 2 BRK-A plz

Agreed. My favorite example of regulation gone too far for retail is PDT which is directly harmful to risk management and systematic trading. Another is the EU prohibiting me as a EU citizen to trade American ETFs (like WTF).

That would have been the winning follow up move, yeah. At 20 you got a whole life ahead of you to recover.

You misunderstood "starting out". When you have no existing codebase, the choice is easy: Pick Python (or maybe R if you're a statistician or data scientist). However, he's already on a Java codebase. There's Weka (which he's using), deeplearning4j, etc. Unless he's looking for some particular...

Java has a couple of decent ML libs actually and for a long time stronger than C# (owing from Java being very popular in academia for a long time). I think he will manage to do what he wants to do in Java. For someone starting out fresh Python would probably be a better choice, though.

I assume it's the repeated one sentence threads with inadequate exposition.

lol

Markets should have supported fractional shares from the start in the interest of equality [ideally, obviously technology was needed]. Don't think it says anything about a top or what not. As for IB competing with RH; it never hurts to foster customer loyalty with someone that might only be...

Anecdotally, to me it seemed bulls have dominated retail online conversations for a few weeks now, then again I read also investment forums with long only guys. Bears (raises hand) get lured in and slaughtered every time.

What do you think went wrong? Too short training data?

Limit orders in general open you up to adverse selection as other market participants are keen to fill you at a good time for them (which can be a bad time for you, especially considering HFT). I would only use them in backtested strategies where they have been shown to be helpful.