Fig 1.
Silhouette score by number of topics.
Fig 2.
Flow of method.
Fig 3.
Distribution of YouTube video counts by language skill categories.
Fig 4.
Word cloud for basic language skill category.
Fig 5.
Distribution of sentiment analysis.
Fig 6.
Sentiment polarity scores.
Fig 7.
Comment counts by video counts.
Fig 8.
Distribution of clusters.
Fig 9.
Video counts of language learning categories by months.
Fig 10.
Distribution of sentiment classes by months.
Fig 11.
Average sentiment scores.
Fig 12.
Average sentiment scores of language learning categories.
Fig 13.
Average sentiment scores vs sentiment classes.
Fig 14.
Average sentiment scores vs clusters.
Fig 15.
Language learning categories vs sentiment classes.
Fig 16.
Sentiment classes vs clusters defined by experts.
Fig 17.
Language learning categories vs expert clusters.
Fig 18.
Category vs cluster vs classes.