1. Stock Price Prediction Based on Social Network A survey Presented by: CHEN En

2. Outline Introduction Related work Methodology Conclusion

3. Introduction Related work Methodology Conclusion Outline

4. Stock price prediction Act of trying to determine the future value of company stock or other financial instrument trade on financial exchange Successful prediction could yield significant profit! Introduction

5. The efficient-market hypothesis Stock price movement are governed by the random walk hypothesis Inherently unpredictable However, the others disagree and possess myriad prediction methods to gain future price information Fundamental analysis - Performance ratio (i.e. P/E ratio) Technical analysis - Charting analysis (i.e. Head and shoulder) Alternative methods - Internet-based data source for prediction

6. Related work Methodology Conclusion Outline

7. Traditional investment decision approaches: Capital asset pricing model (CAMP) Arbitrage pricing theory (APT) Unrealistic and time complexity of the required calculation make them not applicable in real world problem Current soft computing techniques: Neural network (NN) (A. N. Refenes, M. Azema-Barac, and A. D. Zapranis1993) Genetic algorithm (GA) (R. Riolo, T. Soule, B. Eorzel2008) Support Vector Machines (SVM) (G. H. John, P. Miller, and R. Kerber1996) Because of widely use of the social network, major prediction are based on these public information. Related work

8. Why social network? Ubiquitous and important for content sharing Facebook, Blog, Twitter feeds, etc. Public informationeasily obtained Behavioral economics demonstrate that emotions can profoundly affect individual behavior and decision-making Recent research suggests very early acting prediction indicators can be extracted from online social media Online chat activity predicts book sales (Gruhl, D, Guha, R, Kumar, R, Novak, J2005) Blog sentiment predicts movie sales (Mishne, G & Glance, N.2006) Consumer spending indicate disease infection rates (Choi, H & Varian, H.2009) Related work

9. Introduction Related work Methodology Conclusion Outline

10. Analysis of the relation between twitter messages and stock market index Selection of happiness and unhappiness words Method 1: Twitter message and the stock price

11. Analysis of the relation between twitter messages and stock market index Selection of happiness and unhappiness words Evaluating both happiness and unhappiness words in the same tweet Where f=frequency of ith word, Avg_happiness(wordi)=happiness value of word and Avg(T)=average happiness of given tweet

12. Method 2: Twitter mood predicts the stock price Analyzing the text content of daily Twitter feeds to find the correlation between stock price and twitter mood Phase 1: Using two mood tracking tools: OpinionFinder & Google- Profile of Mood states (GPOMs) to extract feature of mood OpinionFinder: Positive vs. nagetive mood GPOMs: Calm, Alert, Sure, Vital, Kind, and Happy Phase 2: Granger causality analysis to test correlation between Dow Jones Industrial average (DJIA) values and GPOMs and OF values Phase 3: Deploying a Self-Organizing Fuzzy Neural Network model (non- linear model) to test the hypothesis

13. Method 2: Twitter mood predicts the stock price

14. Method 3: Technical analysis with sentiment Combining technical analysis with sentiment analysis for stock prediction Extract feature (using SentiWordNet): Time series data (price and volume) source Social network source (on Engadget) Technical indicators Using a multiple kernel learning framework to learn and prediction the stock price

15. Method 3: Technical analysis with sentiment Technical analysis Emotion analysis

16. Outline Introduction Related work Methodology Conclusion

17. Method 1: It is naïve but useful to predict the stock price index by just using happiness and unhappiness Method 2: The result showed that changes in the public mood state could indeed be tracked from the content of large-scale Twitter feed using simple text processing techniques. Method 3: It is considerable to use multiple kernel learning that covers several features.