А magician ran away from home at fourteen to do card tricks for a living. thirty years later he was a stanford professor proving why your winning streak means nothing.
persi diaconis spent a decade as a professional sleight-of-hand artist before he ever sat through a statistics class. he learned to fool people first. then he spent a career studying why people are so easy to fool.
he is the one who co-wrote the law of truly large numbers, the idea sitting underneath the post above. give enough people enough tries and the impossible stops being unlikely and becomes guaranteed. someone has to be on a twenty-trade streak right now. it was never going to be nobody.
he also proved it takes seven riffle shuffles to properly randomize a deck. casinos were shuffling far fewer than that. and he built a machine that flips a coin to the same face every single time, because a coin toss is only random when you do not control the conditions.
that is the whole lesson. randomness is not a property of the world. it is a measure of how little you know about it.
no model. no private dataset. a card table, then a lecture hall.
the tricks are free. the math is free. the doubt is the only part you have to build yourself.
@quant_fold worth adding he never ran full kelly. he sized well under it, because full kelly drawdowns are brutal even when the edge is real.
he used the formula as a ceiling, not a target. most people read it the other way round.
@0x_Ito worth adding that the rule is narrower than it sounds. you don't override a trade, but you absolutely can retire a signal.
the intervention happens at the model level on research time, not at 3pm with the position open. that's the part people skip when they try to copy it.
@andreysuperior the thing you almost said out loud: a salary is itself an insurance product. the company eats the revenue risk, you get a fixed payout, and the ceiling is the premium you pay for it.
so way 1 isn't missing way 4. you're just on the buying side of it.
@Vektrix medallion's also capped though. they push the profits back out every year to keep it around 10bn.
same firm ran a public fund with the same people and the same math, never got close. edge just doesn't survive size
@maximumxspace the important detail is what starlink isn't doing here.
a car with no steering wheel can't depend on a link to drive the autonomy has to hold at zero connectivity or it doesn't ship.
the satellite isn't keeping it safe. it's keeping it supervised.
the better joke is what markowitz did with his own money.
for his retirement account he skipped the optimizer entirely and split it 50/50 stocks and bonds. he said he wanted to minimize future regret, not variance.
the man who invented it charged himself nothing and used none of it.
Honestly the falling part is the smartest bit here. For years the whole industry was obsessed with never letting a robot fall, and it turns out that was the wrong goal. Let it fall a thousand times in sim, log every stumble, and it figures out balance way better than any hand-coded rulebook ever could. That's also why open-sourcing the whole stack (not just the hardware) matters so much - a small team can now build on top of something that already works instead of reinventing balance control from scratch. Still, worth remembering we're at "cool prototype" stage, not "coworker" stage. Battery life, cost, and messy real-world environments are a different beast than a controlled lab floor.
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