Based on the analysis of characteristics of the network public opinion in different periods, this study presents three key elements to build the network public opinion early warning index system. We analyzed secondary events which had not been considered in other index systems and modified the definition of some index. Then, we added a part of new indicators and validated it in combination with the qualitative analysis, quantitative analysis and concrete examples. Finally, we built a scientific, rational and comprehensive warning index system of public opinion. The index system can provide theoretical support for monitoring public opinion by the government and relevant departments.
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