I only agree with Technical Models as being off topic here. Everything else, including commodities is totally on topic. We want to attract advanced money people here, and sticking to basic trades and topics (like I make) might not do the trick. I think a broker would be a great user, whereas an Quantitative analysis researcher is not.
So long as an individual can do the advanced trade legally, then the question is valid for personal finance.
Off topic questions would be
- Things people simply cannot do without being a large institution or regulated industry.
- Calculations that predict outcomes (or creating equations)
On topic questions could be
- Calculations that compare items (using equations)
- Any kind of trade that I can do with my broker.
I don't understand half of them, but the equation questions should stay.
(However since I don't understand the equations, I don't feel qualified to weigh in. Even historical analysis could be on topic. Again, I am assuming that we are using available and existing tools, not making new ones.)
On one hand some terrific bloggers provide awesome help with Excel, on the other I see equations meant to bend space and time.
Really anything that a common online broker interface lets you do should be good here. I am a Ronco style investor (set it and forget it) , but I know I can get an account for trade currency, so that is on topic. But the clever folks that can use tactics and tools to buy and sell are welcome and on topic.
Finally, we should dovetail our definition of on topic with the definition of off topic on the Quant site. That would make it clearer.