特定事件微博与新闻报道话题对比研究

该文描述了基于特定事件的新闻报道和微博在话题层面的对比研究。首先利用LDA话题模型抽取两种媒体上关于特定事件的话题,然后提出了话题关注度、差异度、演化度的定义和计算公式,改进了不同媒体话题差异度的计算方法,最后,选取四个不同种类的事件,进行实验对比与分析,结果显示,关于同一事件,1)微博上评论性话题较多,话题关注度值比较接近;新闻报道上事实性话题较多,话题关注度值差异较大;2)微博与新闻报道对评论性话题词汇差异度大,事实性话题词汇差异度小;3)微博上评论性话题持续时间较长,内容变化较少;新闻报道上事实性话题持续时间较长,内容变化较少。

Comparing Topics from Microblog and News Media about Specific Events

This work conducts a contrastive study on the topics of specific events from microblog and news media. Firstly, we use LDA to extract topics from the two media, and then define three indexes: attention factor, diversity factor and evolution factor for an improved topic discrepancy calculation. Finally, we chose four events of different types for experiments and analysis. The results show: 1) There are more comment topics appearing on microblog with close attention factors in contrast to a high proportion of factual topics with varied attention factors in the news media. 2) In both microblog and news media, diversity factor of words used in the comment topics is bigger than that in factual topics. 3) In microblog, comment topics last longer with consistent contents, while the factual topics does so in the news media.