Tarun Ramadorai

Bio: Tarun Ramadorai is an academic researcher from Imperial College London. The author has contributed to research in topics: Hedge fund & Market liquidity. The author has an hindex of 36, co-authored 121 publications receiving 6470 citations. Previous affiliations of Tarun Ramadorai include University of Oxford & Economic Policy Institute.

Redefine Statistical Significance

Abstract: We propose to change the default P-value threshold for statistical significance for claims of new discoveries from 0.05 to 0.005.

Hedge Funds: Performance, Risk, and Capital Formation

Abstract: We use a comprehensive data set of funds-of-funds to investigate performance, risk, and capital formation in the hedge fund industry from 1995 to 2004. While the average fund-of-funds delivers alpha only in the period between October 1998 and March 2000, a subset of funds-of-funds consistently delivers alpha. The alpha-producing funds are not as likely to liquidate as those that do not deliver alpha, and experience far greater and steadier capital inflows than their less fortunate counterparts. These capital inflows attenuate the ability of the alpha producers to continue to deliver alpha in the future.

Hedge funds: performance, risk, and capital formation

Abstract: We use a comprehensive data set of funds-of-funds to investigate performance, risk, and capital formation in the hedge fund industry from 1995 to 2004. While the average fund-of-funds delivers alpha only in the period between October 1998 and March 2000, a subset of funds-of-funds consistently delivers alpha. The alpha-producing funds are not as likely to liquidate as those that do not deliver alpha, and experience far greater and steadier capital inflows than their less fortunate counterparts. These capital inflows attenuate the ability of the alpha producers to continue to deliver alpha in the future.

Asset Fire Sales and Purchases and the International Transmission of Funding Shocks

Abstract: We uncover a new channel through which shocks are transmitted across international markets. Investor flows to funds domiciled in developed markets force significant changes in their portfolio allocations to emerging markets. These forced trades affect equity prices, correlations between emerging markets, and the developed-market betas of emerging markets. These funding-driven fire sale effects are related to, but distinct from those arising purely from high fund holdings or high overlapping ownership of emerging markets in fund portfolios. A simple model and calibration exercise highlight the importance to these findings of 'push' effects from funds' domicile countries, and 'co-ownership spillover' between markets with overlapping fund ownership.

Caught On Tape: Institutional Trading, Stock Returns, and Earnings Announcements

Abstract: Many questions about institutional trading can only be answered if one tracks high-frequency changes in institutional ownership. In the United States, however, institutions are only required to report behavior from the "tape", the Transactions and Quotes database of the New York Stock Exchange, using a sophisticated method that best predicts quarterly 13-F data from trades of different sizes. We find that daily institutional trades are highly persistent and respond positively to recent daily returns but negatively to longer-term past daily returns. Institutional trades, particularly sells, appear to generate short-term losses--possibly reflecting institutional demand for liquidity--but longer-term profits. One source of these profits is that institutions anticipate both earnings surprises and post-earnings-announcement drift. These results are different from those obtained using a standard size cutoff rule for institutional trades.

Nudge: Improving Decisions about Health, Wealth, and Happiness

Abstract: NUDGE: IMPROVING DECISIONS ABOUT HEALTH, WEALTH, AND HAPPINESS by Richard H. Thaler and Cass R. Sunstein Penguin Books, 2009, 312 pp, ISBN 978-0-14-311526-7This book is best described formally as a general explanation of and advocacy for libertarian paternalism, a term coined by the authors in earlier publications. Informally, it is about how leaders, systems, organizations, and governments can nudge people to do the things the nudgers want and need done for the betterment of the nudgees, or of society. It is paternalism in the sense that "it is legitimate for choice architects to try to influence people's behavior in order to make their lives longer, healthier, and better", (p. 5) It is libertarian in that "people should be free to do what they like - and to opt out of undesirable arrangements if they want to do so", (p. 5) The built-in possibility of opting out or making a different choice preserves freedom of choice even though people's behavior has been influenced by the nature of the presentation of the information or by the structure of the decisionmaking system. I had never heard of libertarian paternalism before reading this book, and I now find it fascinating.Written for a general audience, this book contains mostly social and behavioral science theory and models, but there is considerable discussion of structure and process that has roots in mathematical and quantitative modeling. One of the main applications of this social system is economic choice in investing, selecting and purchasing products and services, systems of taxes, banking (mortgages, borrowing, savings), and retirement systems. Other quantitative social choice systems discussed include environmental effects, health care plans, gambling, and organ donations. Softer issues that are also subject to a nudge-based approach are marriage, education, eating, drinking, smoking, influence, spread of information, and politics. There is something in this book for everyone.The basis for this libertarian paternalism concept is in the social theory called "science of choice", the study of the design and implementation of influence systems on various kinds of people. The terms Econs and Humans, are used to refer to people with either considerable or little rational decision-making talent, respectively. The various libertarian paternalism concepts and systems presented are tested and compared in light of these two types of people. Two foundational issues that this book has in common with another book, Network of Echoes: Imitation, Innovation and Invisible Leaders, that was also reviewed for this issue of the Journal are that 1 ) there are two modes of thinking (or components of the brain) - an automatic (intuitive) process and a reflective (rational) process and 2) the need for conformity and the desire for imitation are powerful forces in human behavior. …

Evaluating Effect Size in Psychological Research: Sense and Nonsense:

Abstract: Effect sizes are underappreciated and often misinterpreted—the most common mistakes being to describe them in ways that are uninformative (e.g., using arbitrary standards) or misleading (e.g., squa...