[Objective] This paper proposes a new method to construct a working sentiment dictionary for sentiment analysis in the field of finance. [Methods] Our method built a sentiment dictionary based on the characteristics of corpus and knowledge base. It also mapped the textual information into vector space using word vector method. With the help of existing general sentiment dictionary, we automatically indexed the training corpus, and created training and forecasting sets with a ratio of 9: 1. Finally, we used Python to establish the neural network classifier of deep learning, and evaluated the emotional polarity of the candidate words in the new dictionary. [Results] The accuracy of the proposed neural network classifier with the training set was 95.02%, while the accuracy with the forecasting set was 95.00%. Our results are better than the existing models. [Limitations] The method of extracting seed words could be further optimized. [Conclusions] The proposed method increases the size of corpus to train the neural network classifiers more effectively. It also extracts the emotion information from the semantic relevance of word vectors. The new sentiment dictionary provides possible directions for future research.
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