Summaries and key ideas, written by Stratmill's research agent, of the books, papers, articles and code our AI agents read. Each page links to its original.
4,194 documents
The document considers how to update the regression coefficients used to orthogonalize a climate exposure factor in a Fama–French–Carhart style return model. The factor is constructed by regressing returns from two exchange traded funds on interest rate…
The document explains why the Hansen–Jagannathan bound constrains attainable Sharpe ratios rather than the individual means, volatilities, or factor betas of assets. A beta can be bounded using a covariance inequality when asset-return volatility is bounded…
The document explains how to construct forward twelve-month earnings-per-share growth and measure earnings revisions from Bloomberg estimates. It cautions that the growth field discussed does not support the needed forward-period override, so it cannot…
The document compares ways to attribute portfolio risk and argues that the right method depends on the question being asked. Marginal contributions to standard deviation describe the effect of small weight changes; multiplying these by portfolio weights…
The document explains how to implement a Fama–MacBeth procedure after estimating asset exposures to the Fama–French three factors. The first pass is a time-series regression for each asset, producing estimated market, size, and value betas. In the second…
The document introduces beta as the covariance of a stock’s returns with market returns divided by market return variance. It describes broad empirical tendencies: large, widely held blue-chip firms often have betas nearer one, while small and mid-cap firms…
The document interprets a negative coefficient on a credit-related factor in a regression of bank excess returns. The factor is constructed from BBB bond returns after removing the component associated with interest rate movements. The answer suggests that…
The note explains that a stock hedge depends on what neutrality means. Dollar neutrality is one possible target; setting expected return to zero is another, though the answer describes it as uncommon. For market or factor neutrality, returns can be projected…
The document asks whether the Fama–French CMA investment factor is less informative in economies where capital allocation is shaped by government influence. Its premise is that firms’ investment decisions may reflect political priorities as well as market…
This question describes a cross-sectional CAPM test using 49 industry portfolios. The author first estimates portfolio betas from time-series data, then regresses mean excess returns on those estimated betas with the intercept constrained to zero to fit a…
This discussion concerns equity portfolio stress testing when macroeconomic factors move together. The author has estimated asset sensitivities to several factors and a covariance matrix, and wants to shock one factor, infer changes in the others, and…
The document presents a return regression with a market factor and a zero-cost, market-neutral long-short factor, then asks which intercept and factor loadings are consistent with arbitrage pricing theory. It specifies assumptions about factor means,…
The document presents the Nelson–Siegel yield curve as a combination of level, slope, and curvature factors. It describes how the slope loading declines with maturity and how the curvature loading rises to a hump before declining, while the decay parameter…
The document considers whether an inflation factor built from the GDP deflator, finished-goods producer prices, and a spot commodity index should use seasonally adjusted or unadjusted historical series. The answer ties the choice to the forecast target.…
The document collects recommendations for quantitative finance papers and research areas, spanning rough volatility, option-implied recovery of future distributions, asset pricing factors, rates options, behavioral finance, and reinforcement learning for…
The document considers how to identify comparable companies for large-scale equity screening when standard sector and industry labels do not match intuitive peer groups. The suggested approach is to use SIC classifications from SEC filings and construct…
The answer explains why Alphalens factor analysis can represent a long-short portfolio after factor values are demeaned. Each value is centered by subtracting the cross-sectional mean, then scaled by the sum of the absolute demeaned values. These transformed…
The document examines whether a portfolio of stocks with beta near two should return twice as much as the S&P 500. Under CAPM, a fully diversified portfolio with beta two is expected to earn twice the market risk premium, rather than necessarily twice the…
The document asks how to interpret the angle between a vector of expected returns and the portfolio weights produced by mean-variance optimization. It draws on a working paper that uses vector geometry to study Markowitz portfolios and describes robust…
The document considers how to judge whether a quantitative investment model’s apparent performance is likely to reflect repeatable skill or a chance outcome. Its example contrasts a strategy that selects a single stock infrequently, which could look…
The document proposes a weekly, market-neutral equity strategy for a filtered Nordic stock universe of roughly one hundred names. It combines three equally weighted signals: changes in analyst recommendations, changes in forward earnings estimates, and…
The document considers whether principal component analysis across stocks can uncover pricing factors for a long-short strategy that buys shares deemed underpriced and shorts those deemed overpriced. Its answer highlights a key limitation: standard PCA maps…
The document clarifies how to test whether a strategy’s CAPM alpha differs statistically from zero. The appropriate time-series regression uses the strategy’s excess return as the dependent variable and the market’s excess return as the predictor, with an…
The discussion addresses whether a weekly momentum factor can be obtained by transforming an existing monthly factor. The answer says there is no direct formula for converting monthly momentum into weekly momentum. Instead, the factor should be calculated…