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"every single trader out there seems to make the same mistake over and over again. their position size is probably two to ten times more than it should be." martin shkreli built a kelly criterion simulator to test exactly this. "most folks don't actually have an edge when they...

341,984 Aufrufe • vor 2 Monaten •via X (Twitter)

33 Kommentare

Profilbild von Lakota Ma'am
Lakota Ma'amvor 2 Monaten

This is called the Gambler's ruin. You can have an edge against the casino, but with large enough bet sizes you are almost guaranteed to lose it all due to random chance.

Profilbild von The Cat Flaneur
The Cat Flaneurvor 2 Monaten

Interesting how this kind of content surfaces when its time to increase longs size

Profilbild von Allen, Allen, Allen, & Allen
Allen, Allen, Allen, & Allenvor 2 Monaten

And people always make a big deal about how much cash Berkshire/Buffet always have. Good trades or investments don't come around that often. Sitting in a ton of cash equivalent is usually the right thing.

Profilbild von Yishai Cohen
Yishai Cohenvor 2 Monaten

The issue wasn’t position size. Once all the shorts and longs are correlated (as part of the AI trade), all the small positions compound to one large oversized position

Profilbild von black cat
black catvor 2 Monaten

People still listen to him it’s actually peak stupidity

Profilbild von VESKALD
VESKALDvor 2 Monaten

True. And the trap is even deeper - you cant size right before you validated the edge. Kelly needs your real win rate and payoff, and people like to plug in numbers from broken backtest or from imagination. Overbetting is just downstream of overestimating the edge.

Profilbild von Robin Dods : Fenton Capital
Robin Dods : Fenton Capitalvor 2 Monaten

Not sure why we would listen to Martin Shkreli. Probably better to talk to a Quant or someone who understands the (not very complicated) maths. The problem with this entire analysis is that to assess your likelihood of win you have to have a very clear idea of the probability of your win or your loss. Now you can do that in poker much like Edward Thorpe did but it's a damn lot harder to do with equities when the probability is a far less certain. And because the result is quite sensitive to these small changes in probability estimates you can come to what I call the "Kelly Cliff" which gives vastly different answers from not entering at all through to leveraging up. I did some modeling on this a year or two ago. I think it's still useful within the confines of recognizing its inherent problems with equities. But let's not to get too carried away

Profilbild von Stealth Chief Investment Officer
Stealth Chief Investment Officervor 2 Monaten

Gamblers ruin is an easier concept to understand and is related to Kelly. The house (or market) with infinite resources can withstand tail events you cannot

Profilbild von Chuck ʎǝʞuoɯ
Chuck ʎǝʞuoɯvor 2 Monaten

Traders are degenerate gamblers. When they're on the losing side of a trade, they think doubling down is the best bet. If they win, they get a bonus and think they are geniuses.

Profilbild von ShortSniper
ShortSnipervor 2 Monaten

Kelly criterion suggests that you are not risking enough. For a system with a 2:1 reward-to-risk ratio and a 50% win rate, the full-Kelly is 25% of your account per trade. A losing trade reduces the account by 25%, while a winning trade increases it by 50%.

Profilbild von Scott Novitsky
Scott Novitskyvor 2 Monaten

Bonsai

Profilbild von Undercomplicate
Undercomplicatevor 2 Monaten

I fell victim to this so many times within the past ten years. I 100% agree this is the problem every time. Had I been disciplined to size just enough I would have 10xed my initial bag. But I always got greedy.

Profilbild von Darren r-σ²/2
Darren r-σ²/2vor 2 Monaten

This is the formula if you have an estimate of your expected Sharpe ratio:

Profilbild von Billhelm
Billhelmvor 2 Monaten

Wasn’t this the guy who went to jail for securities fraud and pumped up the price of some drug causing misery to millions? And you're gonna listen to him? Good luck

Profilbild von jay
jayvor 2 Monaten

he is somehow humble and relatable. his comment would have been perfect had he said assuming 1:1. is TBPN a reliable source in general? I did watch before thanks to a good friend.

Profilbild von PTW
PTWvor 2 Monaten

Sizing for me is #1

Profilbild von shakermaker.eth
shakermaker.ethvor 2 Monaten

Sizing and risk are skills that typically develop after you’ve blown up once or twice…if you have the drive, mental fortitude, and learn to approach Mr. Market with humility

Profilbild von GalacticSurfer
GalacticSurfervor 2 Monaten

That does not compute. That is equal to saying if a whale trades x amount he will win but a shrimp trading that same amount will lose.

Profilbild von The Great Gazoo
The Great Gazoovor 2 Monaten

It is rather amazing some people go busto with a huge 60:40 edge. Albeit, they don't necessarily trust that they have the edge that experiments tell them they have -- which is a good thing.

Profilbild von Markus N. Reitan
Markus N. Reitanvor 2 Monaten

@Coolbreez016

Profilbild von MindOfMyers
MindOfMyersvor 1 Monat

@MartinShkreli built a Kelly criterion simulator, co-founded a drug company, rewrote pharmaceutical pricing theory, and livestreamed his work with more transparency than any Wall Street exec alive. Then they put him in prison. A man this brilliant deserves a pardon — not a conviction. #PardonShkreli #TeamSHKRELI

Profilbild von gr8statsbatman
gr8statsbatmanvor 2 Monaten

Wow! Shkreli says something really smart! What's the world coming to?

Profilbild von Michael Testarossa
Michael Testarossavor 2 Monaten

Hate em, but so right CC: @jord_ant

Profilbild von J.J. Jejeebhoy
J.J. Jejeebhoyvor 2 Monaten

Use ATR to size with a defined $ risk....

Profilbild von Chloe
Chloevor 2 Monaten

betting like you're the main character is a bold strategy.

Profilbild von Sir Vee
Sir Veevor 2 Monaten

Kelly fraction is: f = p-q f = 0.60-0.40 = 0.20 Plain English: Kelly says invest 20% of your total capital each time.

Profilbild von enterrateucristo
enterrateucristovor 2 Monaten

Where can I use the simulator?

Profilbild von Ginkgo
Ginkgovor 2 Monaten

You don’t really need a simulator to figure out what size you should put on. No one actually tracks their ideas / returns by idea No one actually confirms thesis No one cuts when they are loosing Simple 3 things improves drastically - then use 10% -20% of Kelly max

Profilbild von Onur
Onurvor 2 Monaten

real life scammer is getting on @tbpn incredible work guys.

Profilbild von Larry Panozzo
Larry Panozzovor 2 Monaten

Never go full Kelly

Profilbild von MarloPainter
MarloPaintervor 2 Monaten

Yup.

Profilbild von Nik Zalokar
Nik Zalokarvor 2 Monaten

Position sizing is one of the few levers you fully control. You don’t control tomorrow’s market, but you do control whether one bad sequence ends your trading career.

Profilbild von M. Akuffo
M. Akuffovor 2 Monaten

Sizing discipline matters more than thesis selection in most cycles I've covered. A weaker thesis sized conservatively outperforms a strong one sized aggressively when the drawdown comes.

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2k to 93,200. Another day. Another step closer to 100k. Let me be very clear so nobody confuses this with luck. Accounts do not grow like this by accident. They grow when you stop gambling and start operating with rules. Every trade I take has a reason. Every entry has invalidation. Every loss is accepted before the trade is placed. This is where most people fail. They say they want growth but they trade emotionally. They size too big. They chase moves they missed. They let losers run because admitting they are wrong hurts their ego. The market punishes ego fast. The goal is not to be right. The goal is to be disciplined. I do not need to catch every move. I only need to catch the ones that fit my plan. Flat days are wins. Small green days are wins. Survival is a win. You cannot compound if you are constantly digging out of drawdowns. As the account grows the rules get tighter, not looser. Risk scales slower than confidence. Profits are protected. Trades are fewer but cleaner. This is how you go from small money to real money without blowing up. If you are trying to do this yourself understand something important. The edge is not a secret indicator. The edge is patience. The edge is saying no to bad setups. The edge is showing up every day with the same process whether you are up or down. 93,200 is not the finish line. It is proof of concept. 100k is close. The work stays the same. If you are serious about trading stop looking for shortcuts. Build rules. Respect risk. Let discipline compound.

CooperBaggs 💰🍞

27,606 Aufrufe • vor 9 Monaten

You have 100 dollars and you want 200. Betting red one dollar at a time, your chance is one in 33,171. Betting the whole 100 on a single spin, it is 47.4 percent. The careful version is fifteen thousand times worse. This is also the arithmetic of your trading account, and it means almost everything you have been taught about managing risk is, in the strict mathematical sense, a method for losing more reliably. An MIT professor works this out on a blackboard in a lecture on random walks. The result is called gambler's ruin. Two and a half points of disadvantage is nothing on one spin. But a dollar at a time you are not making one spin, you are making hundreds, and the edge gets a fresh attempt at you on every one of them. It was never the size of the disadvantage. It is the number of times you agree to face it. One hundred on red, once: 47.4 percent. Twenty dollar bets: 37.3 percent. Five dollar bets: 11.1 percent. One dollar bets: 0.003 percent. Mathematicians call the right answer bold play. It was proved optimal for unfavourable games in 1965. It is not a strategy for winning. It is the least ruinous way to play a game you should not be in. If your edge after spread and fees is negative, and for most active retail accounts it is, then your position sizing rule is not protecting you. Risking one percent per trade is the one dollar bet. It arrives at zero with near certainty, just politely, over a longer period, with a spreadsheet. Discipline does not beat a negative edge. It schedules it. All of this reverses if you have a real edge. Then small and frequent is correct and bold play is madness. So the only question that has ever mattered is whether you have one, and the number of people certain they do has never resembled the number who do. Your broker does not need you to be wrong. It needs you to be frequent.

Verax

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