近年來，隨著網路的普及，投資專家在網路投資平台所發表的意見逐漸受到投資者的重視。對於分析師而言，形成一定程度的壓力。當具有影響力的股吧投資專家開始追蹤一家公司時，他們可能會影響分析師繼續追蹤該公司的決定。本研究檢視當具有影響力的股吧投資專家開始追蹤一家公司，對於發佈不同相對盈餘預測偏頗、能力和產業經驗的分析師停止追蹤該公司之影響。

實證結果顯示，當具有影響力的股吧投資專家開始追蹤一家公司時，能力較低或產業經驗較短的分析師較可能停止追蹤該公司。實證結果亦顯示，當具有影響力的股吧投資專家開始追蹤一家公司時，最初發布樂觀偏頗盈餘預測的分析師並未顯著較可能停止追蹤該公司。

In recent years, with the popularization of the Internet, investment experts’ opinions on online investment platforms have gradually been valued by investors. For analysts, it creates a certain level of pressure. When influential Gub investment experts start following a firm, they may influence the analysts’ decision to keep tracking the company. This study investigates the impact of influential Gub investment experts who start following a firm on the drop decisions of analysts with different relative earnings forecast biases, ability, and industry experiences.

The empirical results demonstrate that when influential Gub investment experts start following a firm, analysts with low ability or short industry experience are likelier to stop covering the firm. The empirical results also present that when influential Gub investment experts start following a firm, analysts who initially issued optimistic and biased earnings forecasts are not significantly likelier to drop the firm.

尹瑩，(2020)，網絡輿論對股票收益率的影響研究，西南財經大學碩士論文。
孔令飛與劉軼，(2016)，個人，機構投資者情緒與證券分析師的樂觀偏差—來自中國A 股市場的證據.南方經濟, (6), 66-81。
塗帥，(2018)，基於網絡輿情的股票信息分析與建模，蘭州理工大學碩士論文。
關靜怡、朱恆與劉娥平，(2020)，股吧評論, 分析師跟踪與股價崩潰風險—關於模糊信息的信息含量分析.證券市場導報, (3), 58-68。
Banker, R. D., Khavis, J., & Park, H. U. (2018). Crowdsourced earnings forecasts: Implications for analyst forecast timing and market efficiency. Fox School of Business Research Paper.
Bhushan, R. 1989. Firm characteristics and analyst following. Journal of Accounting and Economics, 11(2-3), 255-274.
Bradley, D., Gokkaya, S., & Liu, X. (2017). Before an analyst becomes an analyst: Does industry experience matter?. The Journal of Finance, 72(2), 751-792.
Chen, H., De, P., Hu, Y., & Hwang, B. H. (2014). Wisdom of crowds: The value of stock opinions transmitted through social media. The Review of Financial Studies, 27(5), 1367-1403.
Chen, H., Huang, C. T., & Lin, H. W. (2016). Changes in analyst following for less covered firms accompanying regulation fair disclosure: the roles of ability and industry experience. Review of Quantitative Finance and Accounting, 46, 519-541.
Clement, M. B. (1999). Analyst forecast accuracy: Do ability, resources, and portfolio complexity matter?. Journal of Accounting and Economics, 27(3), 285-303.
Clement, M. B., Koonce, L., & Lopez, T. J. (2007). The roles of task-specific forecasting experience and innate ability in understanding analyst forecasting performance. Journal of Accounting and Economics, 44(3), 378-398.
Cliff, M. T., & Denis, D. J. (2004). Do initial public offering firms purchase analyst coverage with underpricing?. The Journal of Finance, 59(6), 2871-2901.
De Franco, G., Hope, O. K., Vyas, D., & Zhou, Y. (2015). Analyst report readability. Contemporary Accounting Research, 32(1), 76-104.
Donghua, Z., & Yujie, Z. (2016). Is It heuristic bias or Interest relation that leads to optimistic earnings forecast of securities analysts?. Management Review, 28(1), 205.
Giannini, R., Irvine, P., & Shu, T. (2019). The convergence and divergence of investors' opinions around earnings news: Evidence from a social network. Journal of Financial Markets, 42, 94-120.
Gu, Z., Li, Z., & Yang, Y. G. (2013). Monitors or predators: The influence of institutional investors on sell-side analysts. The Accounting Review, 88(1), 137-169.
Gu, Z., Li, Z., Yang, Y. G., & Li, G. (2019). Friends in need are friends indeed: An analysis of social ties between financial analysts and mutual fund managers. The Accounting Review, 94(1), 153-181.
Hayes, R. M. 1998. The impact of trading commission incentives on analysts’ stock coverage decisions and earnings forecasts. Journal of Accounting Research 36(2): 299-320.
He, G., Ren, H. M., & Taffler, R. (2020). The impact of corporate tax avoidance on analyst coverage and forecasts. Review of Quantitative Finance and Accounting, 54(2), 447-477.
Hilary, G., & Hsu, C. (2013). Analyst forecast consistency. The Journal of Finance, 68(1), 271-297.
Jame, R., Johnston, R., Markov, S., & Wolfe, M. C. (2016). The value of crowdsourced earnings forecasts. Journal of Accounting Research, 54(4), 1077-1110.
Jame, R., Markov, S., & Wolfe, M. (2017). Does crowdsourced research discipline sell-side analysts?. SMU Cox: Accounting (Topic).
Jiraporn, P., Liu, Y., & Kim, Y. S. (2014). How do powerful CEOs affect analyst coverage?. European Financial Management, 20(3), 652-676.
Kadan, O., Madureira, L., Wang, R., & Zach, T. (2012). Analysts' industry expertise. Journal of Accounting and Economics, 54(2-3), 95-120.
Lang, M. H. & Lundholm, R. J.. 1996. Corporate disclosure policy and analyst behavior. The Accounting Review 71(4): 467-492.
Li, N., Xu, N., Dong, R., Chan, K. C., & Lin, X. (2021). Does an anti-corruption campaign increase analyst earnings forecast optimism?. Journal of Corporate Finance, 68, 101931.
Liu, W., Jiang, Q., Jiang, H., Hu, J., & Qu, Q. (2022). A sentiment analysis method based on FinBERT-CNN for Guba stock forum. Journal of Integration Technology, 11(1), 27-39.
McNichols, M., & O'Brien, P. C. (1997). Self-selection and analyst coverage. Journal of Accounting Research, 35, 167-199.
Mikhail, M. B., Walther, B. R., & Willis, R. H. (2003). Security analyst experience and post-earnings-announcement drift. Journal of Accounting, Auditing & Finance, 18(4), 529-550.
O'Brien, P. C., & Tan, H. (2015). Geographic proximity and analyst coverage decisions: Evidence from IPOs. Journal of Accounting and Economics, 59(1), 41-59.
Park, C. W., & Stice, E. K. (2000). Analyst forecasting ability and the stock price reaction to forecast revisions. Review of Accounting Studies, 5(3), 259.
Schafhäutle, S., & Veenman, D. (2019). Crowdsourced earnings expectations and the salience of sell-side forecast bias. Working Paper.
Xu, N., Jiang, X., Yi, Z., & Xu, X. (2012). Conflicts of interest, analyst optimism and stock price crash risk. Economic Research Journal, 7, 127-140.
Xiong, X., Chunchun, L., & Ye, Z. (2017). Stock BBS and trades: the information content of stock BBS. Journal of Systems Science and Mathematical Sciences, 37(12), 2359-2374.
Yu, F. F. (2008). Analyst coverage and earnings management. Journal of Financial Economics, 88(2), 245-271.
Zhang, H., Chen, Y. W., Li, S. P., & Ren, F. (2021). Impact of interaction of individual stock bar information on stock price co-movement. Journal of Management Sciences In China.
Zhang, Z. X., & Wu, Z. Y. (2021). Media’s emotional contagion and analyst optimistic bias: Evidence based on the technique of machine learning. Management World, 37(1), 170-185.