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quant desks run Apollo navigation math on their trading terminals and nobody told you Rudolf Kalman published the equation in 1960 NASA used it 9 years later to guide three astronauts through 240,000 miles of space same filter. different problem for NASA: strip sensor noise in real time to...

17,724 просмотров • 16 дней назад •via X (Twitter)

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a citadel options trader told me the one concept they test first in every quant interview and it's been sitting on a free website for years not a hedge fund textbook, not a $3,000 prep program. a free course syllabus - options greeks, volatility, quizzes - publicly available, almost nobody applying has ever opened it concept is expected value across a probability distribution retail looks at a chart and asks which direction. quant looks at expected payout across every possible outcome and asks if that number beats the cost of the trade - completely different question options pricing is just EV made rigorous fair value of any position = sum of (each outcome's probability x its payoff), discounted back. that formula is in every intro stats course and every free options curriculum these firms post publicly citadel's first round isn't a stock pitch or a DCF it's a market-making problem: "set me a bid and ask on a coin flip" if you can solve that fast and size it correctly, you can price any derivative on earth prep is documented in 6 categories: probability, greeks, volatility, mental math, coding, microstructure firms don't want you pattern-matching to old trades. they want raw EV instinct - and that's in free courses that have been online for years entry-level quant traders at these firms start at $300k. senior traders clear $650k+ most people never make it past round 1. not because they weren't smart - because nobody told them what the test was actually measuring Bookmark this they kept you reading charts while they were drilling expected value at 2am

Livsun

25,988 просмотров • 1 месяц назад

an ex-Goldman banker said the key to understanding markets is reading 3 WSJ articles a day a quant at Renaissance would tell you that's the exact wrong input here's why the Wall Street Journal publishes after the move by the time you read "tech stocks fall on rate fears" the move already happened, the positioning already shifted, and every algorithm already repriced news explains what happened. it doesn't predict what's next quant desks don't read news to form trade ideas they measure whether news has a statistically significant effect on price after controlling for everything else the answer, across decades of academic research: individual news articles explain less than 0.5% of daily price variance the other 99.5% is flow, positioning, regime, volatility structure, and cross-asset correlation none of which shows up in a WSJ headline this is the Goldman mindset vs the quant mindset Goldman: read narratives, form opinions, act on conviction Renaissance: measure everything, strip out noise, trade only what survives statistical testing one produced traders who sound smart at dinner parties the other produced $100 billion in profit over 30 years > WSJ subscription: $468/year > SEC EDGAR data: free > FRED economic data: free > exchange-level order flow: free > academic papers on news impact studies: free on ArXiv since the 2000s the banker tells you to read the news the quant tells you to measure whether the news matters those are not the same instruction full breakdown in the video below

delost

15,317 просмотров • 24 дней назад

A lot of people still don’t understand how ruthless systematic trading can be. This is exactly why I run a quant fund alongside everything else I do. The quant fund is built to measure momentum on the 4 hour timeframe. Nothing more. Nothing less. No opinions. No emotions. No discretion. It tracks 15 core stocks and follows the same rule set every single time. When the 4 hour signal line turns green and increases, it buys. When it rolls over and turns red, it exits. Period. This fund does not care what I think. It does not care what I want. It does not care about headlines, FOMC, earnings or narratives. It follows the signal to a T. That’s what makes it so powerful. This is completely separate from my main fund, which is longer term positioning based on monthly and weekly signal lines across sectors. It’s also completely separate from my options trades, which are built around a 2–3 month outlook and larger macro structure. Three different approaches. Three different time horizons. Three different objectives. The quant fund exists for one reason. To systematically capture short term momentum while removing every human weakness that causes traders to fail. The part most people can’t handle? They want to intervene. They want to override. They want to “feel” their way through it. Quant trading doesn’t allow that and that’s why it works. If you want discretion, opinions and emotion… this isn’t for you. If you want structure, probability and discipline… this is how accounts actually compound. That’s everything you need to know about my quant fund and the 4 hour signal line that drives it. THANK YOU FOR YOUR ATTENTION TO THIS MATTER! — TJ #SP500 #SPY #QQQ #TSLA #PLTR #NVDA #AAPL #Bitcoin #Crypto #StockMarket

TraderJonesy

43,814 просмотров • 5 месяцев назад

a quant at a prop firm showed me a 5x5 grid on a napkin said: > this is our entire edge. we don't predict price. we predict which box the market is in and where that box historically leads i didn't understand it for weeks. then it clicked never looked at a chart the same way since grid is called a Markov Chain transition matrix. the math is from 1906, it's in every probability textbook on earth and hedge funds use it because it asks a completely different question than retail traders ever ask retail: will this go up or down quant: what state is this market in, and where does this state typically go every market lives in one of maybe 5-6 states at any given moment tight range, volatility compression, trending with momentum, post-spike reversal, pre-breakout coil not random labels - clusters you identify from actual data using volatility, volume, and momentum readings stacked together once you have the states, you build the matrix: P(state 2 -> state 4) = 73% P(state 4 -> state 1) = 61% P(state 1 -> state 3) = 68% each cell is a historical probability. now when the market is in state 2, you're not guessing you're betting on 73% historical completion. you size it with Kelly. you take the trade when the math says to, not when it feels right i built this on BTC using 2 years of 4-hour data. identified 5 states one i labeled "volatility compression below 20-day mean for 6+ consecutive candles" transitioned to a directional move above 1.8 ATR in 71% of cases average reward/risk on those trades: 5.4 that's not prediction. that's reading a probability table the market keeps filling in for you every single day the part that should bother you: the data to build this is free. the framework is in any quant textbook python to implement it is maybe 200 lines what Renaissance Technologies has that you don't isn't secret data or proprietary signals it's this framework applied to higher-resolution data with more sophisticated state definitions you're not missing information you're asking the wrong question every single time you open a chart

Livsun

188,258 просмотров • 1 месяц назад