eInformation: A Clinical Study of Investor Discussion and Sentiment

Sanjiv Das (), Asís Martínez-Jerez and Peter Tufano

Financial Management, 2005, vol. 34, issue 3

Abstract: We examine the information flow for four stocks over seven months to trace the relationship between on-line discussion, news activity, and stock price movements. On-line discussions support numerous unsubstantiated rumors, substantial on-point exchanges, and quick dissemination of imminent and recently released information. Applying language-processing routines to message board postings and news, we create sentiment and disagreement measures or “eInformation.” We analyze the determinants of sentiment and disagreement, and trace links between news, eInformation, and stock returns. This intensive clinical study of on-line discussions suggests mechanisms individual investors and groups can use to analyze and digest company information.

Date: 2005
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