This paper makes specifics contributions in the methodology of event studies. First, it develops a financial econometrics framework for understanding, measuring and testing the impact of outlier returns on the estimated parameters of stock return models. Second, it presents a maximum likelihood...

This paper develops a skewed extension of the generalized t (GT) distribution, introduced by McDonald and Newey (1988). In particular, the paper derives the mathematical moments and other properties of the distribution and assesses its ability to fit the empirical distribution of several...

This paper investigates the impact and implications of outlier returns for event studies and the pricing of risk. A mixed regression process consisting of a regular and an outlier component is used to model returns for individual stocks. The regular component of stock returns is estimated using...

This paper develops a financial distress model using the statistical methodology of time-series Cumulative Sums (CUSUM). The model has the ability to distinguish between changes in the financial variables of a firm that are the result of serial correlation and changes that are the result of...

Stock returns are decomposed into their regular and outlier components using a maximum likelihood outlier resistant estimation method. Analytical results depicting the impact of outliers on the OLS estimated models and CAR statistics are derived and validated using Monte Carlo simulations. The...

Higher initial margin requirements are associated with lower subsequent stock market volatility during normal and bull periods, but show no relationship during bear periods. Higher margins are also negatively related to the conditional mean of stock returns, apparently because they reduce...

This article investigates the empirical distributions of log-returns of several financial assets at the daily, weekly, monthly, bimonthly, and quarterly frequencies. The results indicate that the distributions possess significant skewness and leptokurtosis. These findings are attributed to...