Abstract
Facts are descriptive user reviews on a specific entity. A number of facts, which contain indirect opinions are called implicit opinions. This study aims to find the word opinion that is implied in the opinion sentence using the help of aspect extraction. Aspect extraction is connected to the opinion word list, thus reducing the search area to find the opinion word. This study had two stages, namely the learning stage and the validation stage. The learning stage focused on co-occurrence matrix opinion extraction using an opinion co-occurrence algorithm and extraction of category of aspects and opinions. The validation phase is to find opinion words that match the implicit opinion sentences based on aspect extraction. The data set is data from hotel user reviews in Yogyakarta from the TripAdvisor website from 2019. The validation results of implicit opinion extraction based on aspect extraction show an accuracy result in aspect extraction of 83.87%, while the accuracy result in opinion extraction is 56.13%.
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