H-TFIDF
Résumé
This project aims to extract discriminative terms on spatial and time windows. We extend TF-IDF into H-TFIDF (Hierarchical TF-IDF). H-TFIDF is a method for term extraction from tweet data based on spatio-temporal criteria. Browsing through spatial and temporal hierarchies (from country to city and month today) provides insight of local concerns at differentscales. This method, applied on COVID-19 relatedtweets, illustrates how public health agencies could