Barber and Lyon (1996a) and Kothari and Warner (1996) document conventional tests of long-run abnormal returns are misspecified. In this research, we propose alternative methods to test for long-run abnormal returns. Our methods have two key characteristics. First, long-run abnormal returns are...

U.S. stocks have been shown to earn higher returns during earnings announcement months than during non-announcement months. We document that this earnings announcement premium exists across the globe. Moreover, it is not isolated to a few countries. Of the 20 countries with enough data to...

We show that abnormal returns to analysts' recommendations stem from both the ratings levels assigned as well as the changes in those ratings. Conditional on the ratings change, buy and strong buy recommendations have greater returns than do holds, sells, and strong sells. Conditional on the...

We analyze the empirical power and specification of test- statistics in event studies designed to detect long-run (one to five-year) abnormal stock returns. We consider (1) the calculation of long-run abnormal returns by comparing summed monthly abnormal returns (cumulative abnormal returns) to...

We document economically large cross-sectional differences in the before- and after-fee returns earned by speculative traders. We establish this result by focusing on day traders in Taiwan from 1992 to 2006. We argue that these traders are almost certainly speculative traders given their short...

This study compares the profitability of security recommendations issued by investment banks and independent research firms. During the 1996 through mid-2003 time period, the average daily abnormal return to independent research firm buy recommendations exceeds that of the investment banks by...

We document that individual investor trading results in systematic and, more importantly, economically large losses. Using a complete trading history of all investors in Taiwan, we document that the aggregate portfolio of individual investors suffers an annual performance penalty of 3.8...

This paper analyzes the distribution of stock ratings at investment banks and brokerage firms and examines their relation to the profitability of analysts' recommendations. Consistent with prior work, we find that the percentage of buy recommendations increased substantially from 1996-2000....

We examine changes in the stock trading behavior and investment performance of 1,607 investors who switch from phone based to online trading during the period 1992 to 1995. We document that young men who are active traders with high incomes and a preference for investing in small growth stocks...

Individual investors who hold common stocks directly pay a tremendous performance penalty for active trading. Of 66,465 households with accounts at a large discount broker during 1991 to 1996, those that traded most earned an annual return of 11.4 percent, while the market returned 17.9 percent....