Ok, fine. But then the fund manager must be counted in the same statistic that I mentioned above: "90% of all day traders lose money" - so now we say "90% of all traders lose money".
The 50/50 proposition has no basis.
No one knows the stats, we don't know how many dead bodies are in the graveyard (the failures) to count and compare against non-failures. That is not the point. The point is to highlight that by sheer luck, a small group in the large sample set can have long winning streaks doing what they're doing and it is possible to be sheer luck.
Traditional day trading using TA to look into past and into the future assumes
1) A deterministic view.
2) Assumes data carries a precise intended message of the future.
Reality is
1) Daily charts, intra-day charts are randomly constructed. Randomness meaning incomplete information.
2) Prediction doesn't predict where it matters/where it has the biggest impact, that is the tails. Data does not embed information about the future.
Wittgenstein’s ruler: Unless you have confidence in the ruler’s reliability, if you use a ruler to measure a table you may also be using the table to measure the ruler. The less you trust the ruler’s reliability, the more information you are getting about the ruler and the less about the table.
The ONLY test of intelligence that counts is to see if the person detects Wittgenstein's ruler situations: 1) When you use a ruler to measure the table, you are also using the table to measure the ruler. 2) The more unexpected the measurement, the more you apply W's ruler.
This means that you're actually getting more information about the tool (Technical Analysis in this case, and it's ineffectiveness) than about the chart you're studying.
But fools keep blaming everything but the ruler in their hands.................................................................... then you have a couple dozen that "succeed" and then the fools believe it is possible, combine that with those that are succeeding and thinking they're god and they start writing ebooks about how they do it, then when others apply their strategy they lose........because it doesn't work!