Recently, with the advent of various information channels, the number of has continued to grow. The main cause of this phenomenon could be found in the phenomenon that the amount of unstructured data is increasing significantly, as the use of smart ...
Recently, with the advent of various information channels, the number of has continued to grow. The main cause of this phenomenon could be found in the phenomenon that the amount of unstructured data is increasing significantly, as the use of smart devices enables users to create unstructured data such as texts, sounds, photos, and movies. In various types of unstructured data, the user s opinion and a variety of information are clearly expressed in text data such as news, reports, papers, and various articles. Thus, active attempts have been made to create new value by analyzing these texts.
The representative techniques used in text analysis are text mining and opinion mining. share certain important characteristics; for example, they not only use text documents as input data, but also use many natural language processing techniques such as filtering and parsing. Therefore, opinion mining is usually recognized as a sub-concept of text mining, or, in many cases, the two terms are used interchangeably in the literature. Suppose that the purpose of a certain classification analysis is to predict a positive or negative opinion contained in some documents. If we focus on the classification process, the analysis can be regarded as a traditional text mining case. However, if we observe that the target of the analysis is a positive or negative opinion, the analysis can be regarded as a typical example of opinion mining. In other words, two methods (i.e., text mining and opinion mining) are available for opinion classification. Thus, in order to distinguish between the two, a precise definition of each method is needed. In this paper, we found that it is very difficult to distinguish the two methods clearly with respect to the purpose of analysis and the type of results.
In this paper, we conclude that the most definitive criterion to discriminate text mining and opinion mining is whether or not an analysis utilizes any kind of sentiment lexicon. We first established two prediction models, one based on opinion mining and the other on text mining. Next, we compared the main processes of the two prediction models. Finally, we compared their prediction accuracy. Then, , we analyzed 2,000 movie reviews. The results revealed that the prediction model based on opinion mining showed higher average prediction accuracy in comparison to the text mining model. Moreover, in the lift chart generated by the opinion mining based model, the prediction accuracy for the documents with strong certainty was higher than that for the documents with weak certainty. Most of all, opinion mining has a meaningful advantage in that it can reduce learning time dramatically, because a sentiment lexicon generated once can be reused in a similar application domain. Additionally, the classification results can be clearly explained by using a sentiment lexicon.
This study has the following limitations. First, the results of the experiments cannot be generalized mainly because the experimental limited to a small number of movie reviews. Additionally, various parameters in the parsing and filtering steps of the text mining may have affected the accuracy of the prediction models. However, the contribution of this research can be found in that it performed and compared text mining analysis and opinion mining analysis for opinion classification. In future works, a more precise evaluation of the two methods should be made through intensive experiments.