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.
16,761 documents
The document describes solving for the risk-aversion parameter in a mean–variance portfolio setup. Portfolio weights are expressed as a function of the parameter, expected returns, the covariance matrix, and a budget constraint. Those weights are substituted…
The document considers how to validate a low-frequency crypto strategy with roughly 25 trades per year, focusing on the limits of statistical evidence from a small sample and the dependence introduced by adding correlated assets. One reply suggests extending…
The document explains how correlation between two stocks’ Brownian shocks relates to correlation between their simulated price levels under correlated geometric Brownian motion (GBM). It gives formulas for each asset’s mean and variance, their joint…
The document explains that the VIX Flip indicator can be approximated with Williams VIX Fix, a synthetic volatility measure calculated from the highest close over a recent window and the current period's low. The reported formula expresses the gap between…
The document asks whether EGARCH volatility forecasts are biased and seeks a published academic source supporting that claim. It identifies a preprint on bias correction for EGARCH estimators and a published study of finite-sample properties of EGARCH…
The document describes an attempt to check the optimal consumption and investment policy in Merton’s portfolio problem by simulating wealth paths and comparing average terminal utility with an analytical value function. It gives a discretized wealth update,…
The document outlines a proposed backtest of a receiver swaption under a one-factor Hull–White or Gaussian Markov HJM framework. It describes forward rates in Musiela form, relates continuously compounded yields to average forward rates, and gives an…
The document presents an attempted trinomial-tree implementation of an uncertain volatility model for pricing European calls between minimum and maximum volatility bounds. It lays out a backward-induction scheme, defines a discrete second-difference term…
The document clarifies that geometric Brownian motion can be simulated by multiplying lognormal price relatives across time steps. In the direct approach, each step’s gross price ratio should itself be lognormally distributed, with log-mean and…
The document considers how much historical data is appropriate for evaluating a trading strategy, especially one that trades frequently. It argues that the useful horizon depends partly on average holding period and market structure: longer-horizon…
The discussion shows that the number of stocks worldwide depends on how the universe is defined and which source is used. It cites MSCI global index factsheets as a way to estimate investable coverage: one broad index included large, mid, small, and micro…
The document compares ways to choose the drift parameter in a recombining binomial tree. It describes the Cox–Ross–Rubinstein construction, which uses symmetric log-price steps, and an alternative that adds a fixed drift to the up and down multipliers. It…
The document asks why correlations, regression coefficients, and R-squared change when monthly observations are expanded into daily observations using linear interpolation. Its central point is that the computed correlation depends on the observations…
The document describes a daily-rolled backtest of EURUSD options using one-month and two-month straddles, 25-delta risk reversals, and 25-delta butterflies. Each position is held for one trading day, with the next day's valuation using the full volatility…
The document proposes choosing a retail time-deposit term by calculating the net present value of deposits with different maturities and converting each value into an equivalent constant annual payment over its term. It selects the term with the highest…
The document describes a bond discount-curve fitting error in QuantLib. The questioner supplies bond maturities and coupon rates alongside market prices, then constructs fixed-rate bond helpers for a Nelson–Siegel fitted discount curve. The reported…
The document frames the Jane Street market prediction task as choosing whether to take each opportunity using anonymized features, trade weights, and realized outcomes. Its objective combines aggregate profit with a clipped Sharpe-like factor, so a…
The document proposes generating trading alpha by predicting index additions and deletions before an official announcement. The suggested approach is to build an algorithm that tracks stocks in a target market and applies the index provider's published…
The document asks whether Bloomberg Barclays monthly total and excess returns can be reproduced from constituent-level index data, including constituent returns, market values, and excess returns. The author reports a close but imperfect tie-out for a broad…
The document summarizes screening practices for using Thomson Reuters Datastream in empirical equity research, with particular relevance to momentum strategies. It highlights risks from rounded prices, erroneous extreme returns, nonlocal listings, depositary…
The document examines whether removing factor exposure from a trading signal or from forward returns produces the same performance estimate. With a projection matrix P and residual-maker M = I − P, it writes the strategy’s cross-sectional return as the inner…
The document explains roll-rate analysis as tracking accounts from one delinquency state to another over a fixed interval, then questions whether published portfolio projections follow from the reported transition percentages. It sets up equations to infer…
The document outlines a practitioner framework for evaluating alternative data signals when simple relationships may already be widely known. It recommends writing a specific hypothesis and pass/fail criteria before inspecting results, with the decision…
The document asks whether a quantitative strategy’s useful life can be forecast as returns decay. It distinguishes two possible causes: other traders may discover and arbitrage a strategy, or market conditions may change. The main answer is skeptical:…