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Developing Stock Pattern Searching System using Sequence Alignment Algorithm  

Kim, Hyong-Jun (부산대학교 컴퓨터공학과)
Cho, Hwan-Gue (부산대학교 컴퓨터공학과)
Abstract
There are many methods for analyzing patterns in time series data. Although stock data represents a time series, there are few studies on stock pattern analysis and prediction. Since people believe that stock price changes randomly we cannot predict stock prices using a scientific method. In this paper, we measured the degree of the randomness of stock prices using Kolmogorov complexity, and we showed that there is a strong correlation between the degree and the accuracy of stock price prediction using our semi-global alignment method. We transformed the stock price data to quantized string sequences. Then we measured randomness of stock prices using Kolmogorov complexity of the string sequences. We use KOSPI 690 stock data during 28 years for our experiments and to evaluate our methodology. When a high Kolmogorov complexity, the stock price cannot be predicted, when a low complexity, the stock price can be predicted, but the prediction ratio of stock price changes of interest to investors, is 12% prediction ratio for short-term predictions and a 54% prediction ratio for long-term predictions.
Keywords
Stock; Stock Prices; Searching Pattern; Semi-global Alignment; Kolmogorov Complexity;
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