Google搜尋量指數對臺灣股票報酬與成交量之影響

Google Search Volume Index and Its Effects on Stock Return and Trading Volume of Taiwan Stock Market

李永隆(Yeong-Long Li) ； 杜玉振(Yu-Chen Tu) ； 王瑋瑄(Wei-Hsuan Wang)

《管理與系統》 24卷4期 (2017/10) Pp. 565-590

https://doi.org/10.29416/JMS.201710_24(4).0004

摘要

本文旨在探討投資人注意力對股票報酬與成交量之影響；以Google 搜尋量指數 (SVI)為注意力之代理變數，經篩選臺灣中型100 指數成分股中56 家公司於2008-2015 期間之相關資料為研究樣本，透過追蹤資料 (panel data) 迴歸模型進行分析。經實證發現：(1)不論短期或長期，SVI 與股價報酬或股票成交量在大多時期均呈現顯著正相關；(2) SVI 與股價報酬之正相關程度，表現在低市值公司的強度大於高市值公司，支持Da et al. (2011) 的「規模效應」；(3)當投資人情緒處於相對高潮或低潮時，SVI 對股價報酬或股票成交量均有顯著的「情緒效應」影響。

關鍵字

行為財務學 ； Google ； 搜尋量指數 ； 股價報酬 ； 股票成交量

並列摘要

This study examines the relationship between online search intensity and stock-trading behavior in Taiwan stock market. The search intensity measured by the search volume index (SVI) of company names on Google. Our sample consists of fifty-six stocks of Taiwan Mid-Cap 100 Index from 2008 to 2015. The empirical results are as follows. First, SVI are positively correlated with both stock returns and trading volumes in most periods of the short-term and the long-term. Second, that positive correlation between SVI and stock returns is greater for small stocks than for large stocks supports the size effect of Da et al. (2011). Third, SVI have significant sentiment effects on both stock returns and trading volumes when investors’ sentiment is relatively high or low.

並列關鍵字

Behavioral Finance ； Google ； Search Volume Index (SVI) ； Stock Return ； Stock Trading Volume

參考文獻

周賓凰、張宇志、林美珍(2007)。投資人情緒與股票報酬互動關係。證券市場發展季刊。19(2)，153-190。

蔡佩蓉、王元章、張眾卓(2009)。投資人情緒、公司特徵與台灣股票報酬之研究。經濟研究。45(2)，273-322。

Antweiler, W.,Frank, M. Z.(2004).Is All That Talks Just Noise? The Information Content of Internet Stock Message Boards.Journal of Finance.59(3),1259-1294.

Baker, M.,Wurgler, J.(2006).Investor Sentiment and the Cross-Section of Stock Returns.Journal of Finance.61,1645-1680.

Baker, M.,Wurgler, J.,Yuan, Y.(2012).Global, Local, and Contagious Investor Sentiment.Journal of Financial Economics.104(2),272-287.