2008, we automatically align 1,782 instances of daily trading data with news documents from the previous day.
we use the news information in day t − 1 to predict price movements of stock market in day t. The output classification result [Class +1] represents that the stock closing price will increase compared with the opening price in day t, and  represents that the stock closing price will decrease compared with the opening price in day t. Following Das and Chen (2007) and Xie et al.