Identifying hidden semantic structures in Instagram data: a topic modelling comparison

Roman Egger · Joanne Yu

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Computational and Text Analysis Methods Topic Modeling Sentiment Analysis and Opinion Mining

Abstract

Purpose Intrigued by the methodological challenges emerging from text complexity, the purpose of this study is to evaluate the effectiveness of different topic modelling algorithms based on Instagram textual data. Design/methodology/approach By taking Instagram posts captioned with #darktourism as the study context, this research applies latent Dirichlet allocation (LDA), correlation explanation (CorEx), and non-negative matrix factorisation (NMF) to uncover tourist experiences. Findings CorEx outperforms LDA and NMF by classifying emerging dark sites and activities into 17 distinct topics. The results of LDA appear homogeneous and overlapping, whereas the extracted topics of NMF are not specific enough to gain deep insights. Originality/value This study assesses different topic modelling algorithms for knowledge extraction in the highly heterogeneous tourism industry. The findings unfold the complexity of analysing short-text social media data and strengthen the use of CorEx in analysing Instagram content.

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References

2014Big Data, new epistemologies and paradigm shifts 2018Applying LDA Topic Modeling in Communication Research: Toward a Valid and Reliable Methodology 2019Topic Modeling in Management Research: Rendering New Theory from Textual Data 2018Business intelligence and big data in hospitality and tourism: a systematic literature review 2018Topic modeling in marketing: recent advances and research opportunities

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