Academic Research Insight: The Social Media Factor
Editor’s Note: The Academic Research Insight will be a weekly short-form research summary on research that is directly related to investing. Elisabetta Basilico (a PhD and a CFA!) will be driving the effort, which will supplement our long-form summaries, in-house research, and general research commentary. We look forward to empowering investors through education!
- Title: THE SIXTH FACTOR- A SOCIAL MEDIA FACTOR DERIVED DIRECTLY FROM MEDIA SENTIMENTS
- Authors: JIM LIEW AND TAMAS BUDAVARI
- Publication: THE JOURNAL OF PORTFOLIO MANAGEMENT, SPRING 2017 (version here)
What are the research questions?
- Does the social media factor (created using tweet sentiments from StockTwits.com) explain the time-series variation in return for a sample of securities?
- Is the six factors model (the five factors Fama-French model PLUS the social media factor) better at explaining the cross-section of future returns?
What are the Academic Insights?
With the strong caveat that this study is tested on a short time frame ( January 2013-November 2015) and on a small sample ( 15 stocks), it finds that:
- YES- positive sentiment ( defined as the BULLISH percentage) on stocks is associated with positive returns
- YES- the relationship between stock twits and future returns survives beyond the presence of traditional factors ( the Fama-French five factors model)
Why does it matter?
Financial technology (fintech) is undoubtedly changing the mechanism through which information is assembled and delivered. It is plausible to expect that prices should incorporate all publicly available information both from traditional and non-traditional sources (such as tweets). However, would such a study pass the Harvey et al. (2016) “smell test” of robust research?
The most important chart of the paper:
Elisabetta Basilico, Ph.D., CFA, (@ebasilico) is an independent investment consultant. With co-author Tommi Johnsen, PhD, she is writing an upcoming book on research backed investing. You can learn more at http://academicinsightsoninvesting.com/
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