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Dokumentumok száma: 20,364
The document distinguishes DV01, the dollar change in a bond's value for a unit change in yield, from interest-rate DV01, the dollar value change associated with a one-basis-point parallel upward shift in interest rates. The questioner suggests the…
The document asks whether implied volatilities from a few options can be combined into a single 30-day volatility estimate. It explains that each option has its own implied volatility, so the values are not interchangeable components of one underlying…
The document examines whether to price a call option on a mutual fund using a risk-neutral return assumption or an estimated real-world return. It notes that historical volatility may be used when implied volatility is unavailable, but expected return…
The document explains how to convert a fixed-width exchange data feed that mixes text and binary fields into a readable tabular format. It recommends using the feed specification as a field-by-field map, then processing each record as bytes and converting…
The discussion considers how to represent a cross-currency swap whose notional changes halfway through an accrual period. One response argues that a single coupon period is normally defined using one notional, making an intra-period change ambiguous unless…
The document proposes comparing volatility clustering in return series by fitting hidden Markov models with multiple volatility states. An information criterion such as AIC or BIC can help select the number of states, after which standard HMM estimation…
The document asks how to solve a constrained portfolio optimization problem in R. The proposed objective minimizes portfolio variance while requiring zero covariance with a representative market index, fully invested weights, and an expected return above a…
The document collects responses to a trader seeking a Python interface for automating non-high-frequency stock strategies. The trader already has an Interactive Brokers account and asks whether another broker offers a better supported API than unofficial…
The discussion explains why the absence of calendar spread arbitrage is commonly expressed as non-decreasing total implied variance, defined as implied volatility squared times maturity, at fixed forward moneyness. It starts from the condition that…
The document asks whether investors can buy a derivative that offsets an asset’s uncertainty while retaining its expected value. It contrasts two hypothetical assets with similar average outcomes but different ranges, then suggests that an investor might pay…
The note explains how a portfolio turnover formula separates weight changes caused by trading from changes caused by asset returns. It first estimates each stock’s end-of-month weight under a no-trading assumption: its starting weight is adjusted by its…
The note considers minimizing the conditional value at risk of a random variable capped above by a nonnegative decision level. It derives the value-at-risk of the capped variable from the distribution function, then evaluates CVaR in two cases depending on…
The answer explains how to set the time units when calculating Yang–Zhang volatility from hourly foreign-exchange prices. It distinguishes the basic time unit, which is the spacing between observed closing prices, from the result time unit, which is the…
The discussion addresses how to build a long history of monthly prices for the changing constituents of an equity index. It warns that authoritative historical membership data may require a paid data source, and that current-constituent price histories alone…
The question asks whether research on signals such as RSI should use tick data, since the indicator can fluctuate within a candle and closing-price calculations may miss when a threshold was reached. Tick data can make a long historical sample much larger,…
The discussion distinguishes stationarity from the presence of temporal structure. A stationary Ornstein–Uhlenbeck process can still exhibit mean reversion: when its value moves far from its long-run level, that deviation provides information about its…
The document asks whether Parkinson, Rogers–Satchell, and Yang–Zhang estimators are used to forecast future volatility. The response says they can be used, and highlights Yang–Zhang’s reported comparison with close-to-close volatility estimation: it is…
The main explanation treats gamma as the rate at which delta changes with the underlying price. For a call, delta moves from near zero to near one across underlying prices, so the total area under gamma across prices is one under the simplified assumptions…
The document describes a factor-research workflow: build long-short strategy returns from cross-sectional z-scores of predictive factors, run principal component analysis on the time series of those returns, and retain a subset of components. The researcher…
The document explains how traders use an option-pricing model to estimate position delta and choose a hedge, while recognizing that the estimate depends on the model selected. It addresses the concern that model error can make a calculated delta inaccurate,…
The document solves a finite-horizon stopping problem: roll a fair die up to three times, stop when desired, and maximize the expected value of the final retained roll. It uses backward induction. With one opportunity remaining after a roll, compare the…
The discussion considers how to select liquid, low-cost ETFs spanning broad asset classes and regions for testing a portfolio selection algorithm. It emphasizes choosing funds that closely track indexes with long histories, so older index data can extend a…
The document reviews a Sortino ratio calculation for S&P 500 total returns over a historical sample. It computes daily returns from adjusted closes, treats negative daily returns as downside observations against a zero target, averages their squared…
The document gives an intuitive and risk-neutral pricing explanation for why a call option’s delta rises as the interest rate increases. In the pricing expression, the discounted underlying has dynamics independent of the rate under the associated numeraire,…