Fig. 15 | Scientific Reports

Fig. 15

From: Anatomy of climate change research in Italian doctoral dissertations using a machine learning approach

Fig. 15

Perplexity Analysis for optimal topic selection in Italian dissertations using K-Means. The best choice for the number of topics appears to be 6, as increasing beyond this range results in rapidly increasing perplexity, which suggests a decline in model quality. At 6 topics, the slope of perplexity starts changing, marking the transition point between coherence and unnecessary complexity.

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