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.
4,613 documents
The document clarifies how leverage and financing apply to a long short strategy whose positions vary during the day and are closed before the next session. It presents a profit and loss accounting framework that combines changes in long and short market…
The document explains that leverage can describe an investment financed partly with borrowed money. Its example compares buying an option entirely with personal funds against financing half the premium with debt. The borrowed portion increases the return on…
The discussion distinguishes quantitative trading from technical analysis by the rigor and breadth of the research process, rather than by how complicated an indicator is. A moving average or signal-processing filter can be used by either a discretionary…
The document compares two long-term U.S. Treasury bond futures for outright, long-biased trading. It presents Ultra Treasury Bond futures as having a more consistent volatility profile, attributing this to a more homogeneous deliverable basket and an…
The document considers how to estimate the assets under management a low-frequency equity strategy can support and how to size its orders. It raises average daily volume as a possible liquidity yardstick, while noting that slippage, market impact, and…
The document describes a way to size orders across a geometric price grid so that the average execution price approaches a chosen target. It starts with equally sized orders, whose average price differs from the target, then adjusts each order’s weight…
The document poses an allocation question: how to split capital between an active fund and a passive ETF when the active fund’s risk relative to a benchmark exceeds the investor’s portfolio active-risk budget. It compares two proposed rules: divide the…
The document shows how to account for a short position in open profit and loss using a signed position quantity. In its example, a short position is represented by a negative share count. When the current price falls below the entry price, the position has…
The document examines how to define a return for a futures spread when entering the position does not require paying its notional value. Initial and maintenance margin do not, by themselves, provide a stable measure of the capital committed or at risk. The…
The document explains how to limit the number of assets selected by a linear portfolio optimizer. The motivating case has a large monthly universe, limited trading capacity, and an objective that maximizes the sum of each asset’s score multiplied by its…
The document explains why a portfolio’s computed Sharpe ratio can rise when daily returns are multiplied by a leverage factor, even though the arithmetic daily Sharpe remains unchanged. Under the standard formulation, portfolio excess arithmetic mean and…
The document raises questions about whether risk of ruin (ROR), a concept associated with gambling, can describe trading losses and whether a zero probability in a published table means ruin is impossible or merely very unlikely. It also asks how win rate…
The document asks how a futures backtester should represent the funds required when opening long or short positions. It considers using margin requirements calculated through CME's SPAN system and asks where historical margin data can be obtained, noting…
This answer derives how many shares to sell after a price change to restore an asset to its initial portfolio weight, assuming sale proceeds remain in cash and no outside capital is added. It writes the starting and ending portfolio values, equates the…
This exchange considers whether an asset with negative expected return can still be useful when combined with a portfolio, especially if its returns are negatively correlated or uncorrelated with the portfolio. The answer focuses on expected return relative…
The document asks why traders use leverage if it does not improve a strategy’s risk-to-return ratio. Its answer distinguishes changing a ratio from scaling the amounts represented by that ratio: leverage increases both gains and losses, allowing a trader to…
The document addresses why labels such as long and short can be confusing for multi-leg option strategies. A debit or credit alone does not determine a strategy’s directional classification: spreads, butterflies, and similar structures combine bought and…
The document asks how to reproduce a volatility strategy described in a referenced study: short VXX while holding a long position in a VIX futures contract. It proposes that the combination may isolate exposure to a later futures month, asks how many VXX…
The document asks how to size two stock positions in a long-short portfolio intended as a hedge, rather than as a cointegration-based pair trade. One response gives the basic beta hedge rule: set the hedge position opposite to the original position and scale…
The document examines why daily returns on a leveraged forex trade can become misleading when calculated as daily profit or loss divided by a small account balance. Its example starts with $40 of capital and shows losses pushing the balance close to and then…
The discussion considers how a bond dealer who cannot sell short might adapt a market-making strategy designed for dealers with two-sided inventory flexibility. Its central argument is conditional: if a long-only dealer already holds enough inventory to…
The document asks whether a proposed constrained portfolio optimization setup correctly represents Kelly growth, how its portfolio curve relates to the familiar Kelly parabola, and how Kelly allocation differs from Markowitz mean-variance analysis. The…
The discussion presents stochastic portfolio theory (SPT) as a framework for portfolio growth that accounts for asset variances and co-movements. It contrasts arithmetic expected returns with long-run logarithmic growth, explaining that volatility can reduce…
The document describes a fixed-risk position-sizing approach used in spread betting. The trader chooses a fraction of account equity to risk, measures the distance between entry and stop in points or pips, and divides the cash risk allowance by that distance…