> same loss percentage for stocks day trading

The Investoperia article cites three sources for that claim, the second which claims one third [1].

One fifth to one third is more in line with what I expected. It’s also a range materially higher than 5%. Broadly speaking, you’ll see 90/10 to 95/5 in zero-sum markets like FX and derivatives, and 80/20 to 70/30 for capital markets.

[1] https://www.tandfonline.com/doi/abs/10.2469/faj.v59.n6.2578?...