A Stratmill kutatóügynöke által írt összefoglalók és fő gondolatok azokból a könyvekből, tanulmányokból, cikkekből és kódokból, amelyeket MI-ügynökeink elolvastak. Minden oldal az eredeti műre mutat.
Dokumentumok száma: 20,364
The discussion surveys possible sources for company financial statements, prompted by difficulty finding balance-sheet data for a Swedish listed company through common finance sites. One response reports using Morningstar exports for income statements,…
The document clarifies why the variance of changes in a spread between two correlated geometric Brownian motion assets includes the asset price levels. For the spread defined as the first asset price minus the second, its instantaneous change is the…
The document explains why a same-strike FX call and put do not generally have offsetting deltas, so their straddle is not automatically delta neutral. Put-call parity links call and put deltas through the discounted forward, and a delta-neutral straddle…
The document asks how to calculate the probability that a geometric Brownian motion starting above a lower barrier touches it by a fixed time. It maps the problem to the minimum of a drifted Brownian motion by taking logarithms, then applies a…
The document describes a simulation question for a collection of forward rates whose dynamics are driven by Brownian motions with instantaneous correlations. Each rate follows a proportional diffusion, and the correlation structure varies over time. The…
The document explains how to derive the force of interest, defined as the proportional rate of change in an accumulation function. For simple interest at annual rate i, the accumulation function is linear in time, so its logarithmic derivative varies with…
The document asks why a small positive position in a risky asset improves expected utility when its mean return exceeds the risk-free rate. It decomposes end-of-period wealth into a shifted mean and a zero-mean gamble. The expected utility of that gamble is…
The document explains why trading institutions use backtests despite the inability of historical performance to guarantee future results. One response frames backtesting as part of a scientific process: start with an economic, behavioral, technical, or other…
The document raises a methodological problem in testing whether stock returns are structurally stable over time. The proposed procedure fits an ARMA model to the full sample, estimates that model separately on two subsamples, and uses an F test to compare…
The document examines whether a double-barrier cash-or-nothing option can be priced by subtracting an upper-barrier knock-in binary from a lower-barrier knock-out binary. It defines lower and upper first-hit times and expresses the payoff as the amount paid…
The document derives the asymptotic variance of an estimated Sharpe ratio using the generalized method of moments and the delta method. It defines the mean return and return variance as moment parameters, constructs their covariance matrix from centered…
The document asks how to calculate ex post Sharpe ratios for decile portfolios formed from monthly returns and held for twelve months. It contrasts measuring excess returns over the full holding period with calculating monthly excess returns and annualizing…
The document describes a research problem involving a return series, a conditional mean, and a conditional variance estimated from factor returns. A first trading approach compares each day's realized return with its conditional expectation and trades when…
The document explains why statistical languages such as R or Matlab are commonly useful for model development and backtesting, while lower-level languages are often chosen for stable production systems where performance matters. It presents prototyping as a…
The document addresses which zero rates to use when bootstrapping a default probability curve from credit default swap spreads. The response recommends discounting with the curve relevant to collateral remuneration, typically the applicable overnight indexed…
The document surveys ways to stabilize global minimum-variance portfolio weights when the sample covariance estimate produces extreme allocations. It gives the unconstrained solution in terms of the inverse covariance matrix and describes an equivalent…
The document explains why an off-diagonal covariance in a portfolio risk matrix is difficult to interpret on its own. Covariance combines the scales of both assets’ returns, so its value is not directly a percentage or a count of standard deviations.…
The document asks whether arbitrage freedom implies completeness in a general binomial model and how the condition that the risk-free return lies between the down and up moves matters. The main response states the standard relationship: existence of a…
The document discusses pricing a call option on a stock expected to pay a fixed cash dividend during the option’s life. It presents two approximations: convert dividends to a percentage yield when payments move with the share price, or subtract the present…
The document asks how to include dividends when regressing the returns of two assets against a target asset, and how to interpret the regression for return and volatility estimates. Its concrete guidance is to avoid an ex-dividend price jump by approximating…
The document explains where to look for records of corporate share repurchases and government crisis-era assistance. For a company’s buybacks, the answer points readers to its annual 10-K filing, where repurchase activity may appear in the statement of…
The document discusses how to build price histories for calculating Value at Risk on a portfolio that may include interest-rate, commodity, and equity futures. Its central concern is that contract rolls, changing liquidity, and commodity seasonality can…
The document explains how a stock’s short interest ratio can fall even when the number of shares sold short rises. The ratio is interpreted as short interest divided by average daily trading volume over a recent period. Therefore, the ratio can decline if…
The document discusses where to obtain historical Eurex Level 2 order book data, with a focus on whether a buyer can select individual instruments instead of purchasing broader exchange coverage. The question describes Eurex’s own data offering as covering…