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.
2,013 documents
The document explains how to combine separately estimated asset volatilities into a portfolio volatility estimate when the assets have nonzero correlations. Its central method is to form the covariance matrix and calculate the portfolio variance as the…
The document raises a portfolio risk management problem: how a fund investing in both public markets and private assets can measure active risk and establish acceptable limits. It identifies private equity, private credit, infrastructure, and real estate as…
The document investigates why Yahoo Finance showed different apparent prices for SWRD.L depending on the chart interval. The accepted answer attributes the discrepancy to a currency and listing mismatch: the daily chart and historical data for the…
The document asks how to add a tactical forecasting layer to a plain risk parity allocation. Its example is anticipating a shift in fixed income from a bullish to a bearish trend and reducing duration to hedge the portfolio. It also asks about forecasting…
A zero floor in a Credit Support Annex prevents the rate paid on cash collateral from falling below zero, even when the overnight index swap rate is negative. The document explains that the floor’s value is relative to an otherwise comparable agreement…
The document asks whether a multi-factor rolling beta can be estimated by regressing a hedge fund index’s returns on several asset-class return series, then repeating the regression over a moving window. It confirms this as the basic approach, while warning…
The document distinguishes a financial instrument from a financial product in its stricter usage. A financial instrument, such as a share, bond, or option, represents legal rights held by its owner; ownership and those rights can be transferred through…
The document compares realized variance computed from a basket’s own time series of returns with variance reconstructed from its constituents’ volatilities, weights, and pairwise correlations. The first method squares and sums basket returns over time; the…
The document raises a modeling question about simulating a currency pair with geometric Brownian motion when the asset is assumed to respond to relative economic performance. It proposes using the difference between the two countries’ GDP growth rates as the…
The document asks how to estimate parameters for three synchronously sampled processes: one geometric Brownian motion and two arithmetic Brownian motions. Their driving Brownian motions have specified correlations with the first process. The proposed route…
The document asks whether investors can find historical records of forecasts for future returns, broken down by asset class and issued at regular intervals. The desired data would preserve what an institution expected at each date for a coming year, quarter,…
The absorption ratio measures the share of return variance captured by a fixed number of principal components. A higher value indicates that asset returns are more concentrated in common factors, which the cited work interprets as greater market fragility.…
The discussion considers how to tell when an investment strategy has become popular or overcrowded. One proposed market-based signal is a shrinking premium: for a short-volatility trade, compare implied volatility with realized volatility and account for…
The document considers how to allocate capital among several assets when one trading strategy can generate signals for multiple assets on the same day. It proposes using historical daily returns to estimate each asset’s variance and cross-asset covariances,…
The document addresses converting a weekly financial risk index into monthly observations by averaging the values assigned to each month. It presents several approaches in R: grouping observations by calendar month with a base-language aggregation function,…
The document explains how a personal finance app can gather investment account data from multiple brokerages. This capability is commonly called account aggregation: information from separate accounts is collected in one place so a user can monitor holdings…
The document considers how to choose an objective end date for historical financial crises when comparing market correlation matrices. The questioner studies broad indices across equities, foreign exchange, credit, and commodities, and mentions principal…
The document distinguishes relative purchasing power parity (PPP) from price-level PPP, two approaches that can produce different estimates of an exchange rate. Relative PPP projects exchange-rate changes from inflation differences between two countries over…
The document compares two ways to calculate returns and volatility for a 70/30 stock-and-bond risk benchmark. One method rebalances to the target weights monthly; the other lets weights drift for a chosen period before calculating returns. The question is…
The document considers whether an investor comfortable with all-equity exposure could hold a diversified stock-bond portfolio and use leverage to bring its volatility up to the level of stocks. The proposed rationale is that the mix may offer better…
The document asks whether an open-source system can combine demo trading, bookkeeping, profit-and-loss tracking, and risk calculations across products such as bonds, repos, equities, foreign exchange, and derivatives. It names Marketcetera and Merchant of…
The document considers whether a hedge fund can meaningfully sum vega exposures across asset classes such as equities and credit. Its central point is that aggregate sensitivities are not exact measures of portfolio risk unless the underlying risk factors…
A minimum-return promise can be viewed from the beneficiary’s side as protection against losses and from the pension fund’s side as a short put. If portfolio returns fall below the guarantee, the fund must cover the shortfall; stronger returns pass through…
The document shows how claims on the minimum or maximum of two asset prices at maturity can be decomposed into one asset plus or minus a call-like payoff on the difference between the assets. In a Black–Scholes setting, the difference payoff can be valued…