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Announcing a New Book on Quantitative Investing: "The Element of Quantitative Investing" Set for April 2025 Release

__paleologo @ twitter

orig

I'm wrapping up my latest book draft, titled "The Element of Quantitative Investing," set for Wiley in April 2025. This book is the culmination of my thoughts on quantitative investing that I’ve wanted to express for a while. It covers essential topics like modeling returns and risk, backtesting alpha, portfolio construction, intertemporal and Kelly criteria, strategy execution, and performance analysis.

I’ve streamlined the content, cutting out unnecessary material to keep it under 500 pages, which makes it a focused read rather than a reference or thesis. The draft is close to completion but still contains typographical errors and needs refinement. The goal is for readers to grasp the core concepts to a level suitable for reimplementation, so the text will contain practical explanations and examples. I deliberately avoid any math newer than 50 years, focusing on timeless concepts relevant for the future.

Feedback is welcomed—email me corrections or comments with "EQI" in the subject line. The draft and related materials are accessible through the provided links, with all chapters currently in a readable state. Notably, I'm keeping the chapters on execution and signal fusion under wraps for now.

@quant_feed
Essential Questions for Assessing Linear Algebra and Regression Insights in Quant Interviews

macrocephalopod @ twitter

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In discussions about quant interviews, there's a significant focus on assessing fundamental concepts rather than practical applications like alpha research or portfolio construction. Specifically, probing candidates' grasp of linear algebra, regression, covariance matrix estimation, and dimension reduction can yield insights into their foundational knowledge. Engaging with others on Twitter reveals a diverse range of preferred questions that target these essentials. Some responses suggest skepticism about the relevance of certain questions, while others emphasize the importance of evaluating a candidate’s core understanding. It's clear that interviewing strategies should emphasize conceptual clarity over rote knowledge.

@quant_feed
Navigating PostgreSQL Connectivity in Python: A Guide to psycopg3 and psycopg2

ryxcommar @ twitter

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Connecting to Postgres in Python is straightforward with psycopg3, the latest driver. Despite its advancements, psycopg2 remains widely used, especially on Mac where you need to install psycopg2-binary. However, for a cleaner setup, your requirements.txt should reference the non-binary version. The consensus in the community seems to lean towards momentum for upgrades, but there’s still hesitance around updating database drivers, suggesting a general reluctance to change in established practices.

@quant_feed
Exploring the Evidence: Were US Stocks Truly "Lost" During Decades of Underperformance?

benjaminwfelix @ twitter

orig

Lost decades in US stocks are painful, especially when stocks trail one-month bills. Analyzing rolling 10-year periods from 1927 to 2023 reveals 145 instances classified as "lost decades," accounting for 14% of all periods. However, 74% of those instances saw the Dimensional US Small Cap Value Index outperforming US bills, with an average market return of +1.89%, resulting in a -2.33% premium over bills.

In contrast, US small cap value saw an average return of +6.45%, enhancing performance by 4.56% annualized above the market. This factor significantly mitigates the effects of fees and costs, which average around 2%.

Looking at Japan from 1987 to 2022, while the Fama/French Japan Market Index yielded only +2.81% annually, the Dimensional Japan Small Cap Value Index return surged to +8.11%. This indicates a consistent pattern where small cap value stocks have demonstrated resilience, despite their inherent risks and occasional underperformance.

Additionally, US large growth stocks have experienced more lost decades than the overall market, with 176 instances. During those periods, large growth underperformed the market by 0.66% annualized. The evidence suggests that small cap value can be a critical component in diversifying risks and enhancing returns, even during challenging market periods.

@quant_feed
Exploring the Significance of Average Cross-Sectional R² in Factor Model Performance Metrics

__paleologo @ twitter

orig

The average cross-sectional R^2 is commonly cited as a primary performance metric for factor models, as noted by Barra and Axioma, but it falls short in several critical areas. First, R^2 does not effectively measure risk model performance, especially in the contexts of hedging or volatility prediction, nor does it correlate with alpha generation.

Furthermore, R^2 can be misleading due to its reliance on model complexity—it's inherently biased as it increases with the number of predictors. This can explain the proliferation of factors in commercial models. Additionally, data mining is a significant risk when assessing R^2, particularly given the limited historical data available for testing.

Despite these drawbacks, R^2 still provides an intuitive grasp of a factor's explanatory power. The challenge lies in rigorously linking population R^2 to genuine factor model performance across risk management and alpha generation, transcending the hurdles posed by finite sample considerations and multiple testing anomalies.

@quant_feed
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Exploring the Balance Between Active and Passive Investment Strategies in Modern Markets

choffstein @ twitter

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There’s a growing recognition that both active and passive investing strategies influence market dynamics beyond their intended effects. We see how active strategies can set prices, while passive investments adjust based on market cap, yet liquidity issues mean these influences aren’t always in sync. This highlights the importance of recognizing how different investment vehicles interact.

Target date funds are surfacing as key players, altering stock correlations, including stock/bond relationships. It's notable that financialization in the 2000s skewed commodity correlations, raising questions about our assumptions regarding market behavior.

Transacting in financial markets inevitably creates some impact—Koijen’s research underscores this point. Additionally, non-informational flows may influence prices more significantly than previously thought. Amid this complexity, discussions around the nuances often get lost, leading to polarized views that oversimplify the intricacies of market interactions.

@quant_feed
The Underestimated Challenge of Long/Short Equity Success in China: A Closer Look at Foreign PMs

systematicls @ twitter

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The challenge of achieving success in China’s long/short equities market is significantly underestimated. I've noticed that very few non-Chinese PMs manage to sustain long-term profitability in this space. This raises a question about potential hidden advantages held by domestic PMs, suggesting they might have exclusive access to critical data or networks, particularly regarding trading suspensions.

I’m curious if there are any academic papers I’ve overlooked beyond the standard studies, particularly focusing on the impacts of trading suspensions in China. Also interested in any relevant anecdotes from others in the field.

It's clear to me that the transparency of data sources is uneven; I suspect domestic investors tap into more nuanced information that goes beyond standard terminals like Wind. This could be a key factor in their success in L/S strategies.

@quant_feed
Estimating Compound Annual Return: A Simple Calculation Method

KrisAbdelmessih @ twitter

orig

To quickly estimate compound annual return, you can use a simple formula: 70% multiplied by the number of doublings to reach your target amount, divided by the number of years. For instance, if you invest $1 and grow it to $250 over 50 years, that's about 8 doublings. So, the calculation would be 70% multiplied by (8/50), yielding an approximate annual return of 11.2%.

In another example, targeting a 4x increase in 10 years involves 2 doublings, leading to a projected return of 14% using the same formula. This mental math trick keeps me engaged and helps clarify return goals from discussions I encounter, minimizing the risk of zoning out on tangential points. Overall, it’s a useful heuristic for understanding investment returns without getting bogged down in excessive details.

@quant_feed
Debunking Common Misconceptions in Algorithmic Trading

pyquantnews @ twitter

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Myths of algorithmic trading include the belief that one needs hundreds of strategies, 12 months of research, and high-frequency trading. In reality, focusing on 1 or 2 solid core strategies is sufficient. It's essential to leverage a supportive community and recognize that basic internet access is adequate for success. Don't fall for the misconceptions; variations on those core strategies are more crucial than sheer volume.

@quant_feed
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Navigating Event Risk in HFT: The Case for Orderbook Withdrawal and Volatility Management

ltrd_ @ twitter

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The recent event highlighted the necessity for HFTs to strategically withdraw from the order book. Although we chose to remain, it’s clear that this would have minimized our exposure to volatility. Understanding that volatility acts as a double-edged sword is crucial; while it can present opportunities, it also requires careful management to avoid unnecessary risks. This analysis emphasizes the importance of adapting to market conditions and adopting agiler strategies. I’m eager to hear your thoughts on navigating such volatility and any insights you might have on effective order book management.

@quant_feed
Exploring the Value of Negatively Correlated Alphas in Portfolio Strategies

macrocephalopod @ twitter

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Finding a new alpha that is negatively correlated to existing alphas offers a fresh avenue for diversification, especially when the common approach revolves around identifying existing alphas. The nature of each alpha matters significantly. If the alpha is derived from a unique, unexploited dataset, integrating it can enhance overall strategy effectiveness. Conversely, if it merely combines existing datasets without adding predictive value, it's likely best to discard it to avoid redundancy. This nuanced understanding of alpha sourcing can lead to more robust portfolio construction.

@quant_feed
Optimizing Ridge Regression: Enhancing Forecasts with Beta Rescaling

macrocephalopod @ twitter

orig

When applying ridge regression, it's effective to rescale forecasts to achieve a beta of 1 relative to the dependent variable. This process allows us to harness the advantages of ridge regression while avoiding overly diminished predictions. The key is to regress the observed values against the predicted values to obtain a scaling factor, which we then use to adjust both the coefficients and forecasts accordingly. It’s a smart way to maintain prediction integrity while managing multicollinearity.

@quant_feed
Exploring the Role of Rust in High-Frequency Trading Discussions

Dub0x3A @ twitter

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Rust's role in high-frequency trading (HFT) is a hot topic, and I resonate with @0xAlcibiades on the challenges it presents. Despite barriers, the coding experience in Rust is quite fulfilling, which is a silver lining. There’s a keen observation about firms like Citadel stalling on Rust adoption, likely to avoid the investment in necessary tooling and training for their developers. Ultimately, the shift to Rust seems inevitable as the industry evolves.

@quant_feed
Optimizing High-Frequency Trading Systems for Peak Performance and Cost Efficiency

TimMeggs @ twitter

orig

Much of HFT engineering focuses on optimizing message handling during peak loads, which are infrequent. This leads to systems that are often overprovisioned yet underutilized. One potential solution is to pre-compute calculations that are typically performed in real-time during high-load scenarios. By storing these computations in a map, you can effectively reduce the latency of complex calculations to the quicker lookup latency, enhancing overall system efficiency.

@quant_feed
Exploring Automated Systems for Alpha Discovery in Long-Short Strategies

oxbquant @ twitter

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I was diving into @quant_arb's insights on ranked long-short strategies and the idea that successful "alphas" are essentially just formulas derived from quantile partitioning for alpha scoring. It got me thinking; surely there's potential for an automated discovery system to enhance these strategies. This could lead to an interesting summer project, where I envision a process that starts with a model generating alpha formulas, then filters out the underperformers based on metrics from backtesting. The next step would involve leveraging LLMs to evaluate the formulas and identify those with the strongest fundamental rationale.

Interestingly, I was also considering genetic algorithms for this approach but realized there's a need for better explainability in how these alphas work. Using LLMs could provide that clarity and understanding, wrapping up a potentially sophisticated project. Engaging with thoughts from @systematicls and @0xfdf could also refine these ideas further.

@quant_feed
Exploring Optimal Stopping in Dice Rolls: Valuing a Two-Roll Game

BlackSwan_ptf @ twitter

orig

The optimal stopping problem with dice rolls is a classic scenario relevant to American options pricing, drawing parallels to decision-making strategies in stochastic processes. The core question is the expected payoff from rolling a die twice with the option to stop after each roll for a payout equal to the die's face value. This type of problem frequently appears in interviews, emphasizing its significance in quantitative finance. The insights shared by Satyaki in his lecture provide a comprehensive understanding, while Ito Windsor's thread offers a richer exploration of the underlying concepts. Engaging with these resources deepens appreciation for the intricacies of probability in financial contexts.

@quant_feed
Decoding the Ineffective Urgency in Market Commentary: A Case Study from Moontower

KrisAbdelmessih @ twitter

orig

This week's discourse around Moontower revealed a lot about the common sentiment in investing tweets. Many discussions lack actionable insights, often relying on urgency without substance. My approach is to prioritize risk over expected returns—what I term “Know Nothing Sizing.” Systematic risk is irreducible, and while there’s an equity risk premium, we need to remain skeptical of both bullish and doomsday narratives.

Investing isn't just about being right—it's about being pragmatic. I advocate for a portfolio constructed with an emphasis on volatility stability over return expectations. The reality is, you will encounter drawdowns, but understanding your risk exposure and risk management is crucial, regardless of market timing pretensions. The essential chaos of the market is a given; our focus should be on diversification and acceptance of systemic risk.

In every investment journey, it’s critical to remain vigilant and harbor a healthy paranoia without falling into lazy doomerism. The market does not always behave predictably, and if you're not prepared for volatility, your approach is fundamentally flawed. In the end, if you choose to hide from the market, you're only delaying the inevitable.

@quant_feed
Evaluating the Role of Univariate Return Properties in Financial Literature: To Keep or Not to Keep?

__paleologo @ twitter

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I am evaluating the necessity of my chapter on univariate return properties for my upcoming book. While I appreciate the content, it feels disconnected from the overall flow. My guiding principle is that if something can be cut, it should be, in line with Hattori Hanzo’s philosophy. Currently, I’m considering whether to retain the chapter or move it to an appendix, but then I'd risk overwhelming readers as Chapter 3 is already 30 dense pages. This chapter has undergone significant trimming; it was initially twice as long before I removed sections on elliptical distributions and much of realized volatility.

@quant_feed
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Embracing Optimal Conditions in Volatility Trading: A Reflection on Recent Market Movement

BeatzXBT @ twitter

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Market conditions are currently favorable, and I'm managing to secure solid fills. It's an ideal time for trading, and excitement around live-streaming trading activity is palpable; anyone can engage with the open-source nature of the tools available. My strategy involves closely monitoring target quote prices, making real-time decisions within a tight offset range. Engagement and collaboration within the quant community are key for capitalizing on these conditions.

@quant_feed
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Exploring Market Dynamics: The Intersection of Brain Teasers and Predictive Trading

macrocephalopod @ twitter

orig

The complexity of modern finance often overlooks fundamental skills. Despite advancements in theoretical frameworks like Brownian motion, relativity, and mathematical proofs, the inability to perform simple calculations, such as the variance of rolling two dice, signals a disconnect. This highlights a critical gap in quantitative literacy that could inhibit progress. Mastery of basic concepts is essential; without it, we risk becoming irrelevant. Focus on foundational knowledge is key to truly understanding and innovating in the quantitative space.

@quant_feed
A Critical Perspective on Hyperliquid: Drawing Parallels with FTX

liquiditygoblin @ twitter

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Hyperliquid is essentially the on-chain equivalent of FTX, lacking credibility. Its design choices, marketed as trader-friendly, are often misguided or intentionally deceptive. I can identify and front-run all TWAPs, indicating a structural flaw. Additionally, the tender mint sequencing is centralized under the same entities managing the HLP vault and development. This mirrors the environment of FTX, raising serious concerns about trust and integrity in the platform.

@quant_feed