Table 3. Comparison of perplexity and coherence scores for different topic numbers in forest operation and forest operation safety.

Topic	Forest Operation			Forest Operation Safety
	Perplexity	Coherence Score	Sum	Perplexity	Coherence Score	Sum
2	−8.67179	−4.63116	−13.3029	−8.00949	−12.024	−20.0335
3	−9.14237	−4.95487	−14.0972	−8.55683	−12.6055	−21.1623
4	−9.64377	−6.62437	−16.2681	−9.06337	−11.8017	−20.8651
5	−10.119	−5.92508	−16.0441	−9.65082	−11.9821	−21.6329
6	−10.4313	−7.20202	−17.6333	−10.1267	−11.6547	−21.7815
7	−10.8342	−6.77492	−17.6091	−10.321	−10.5772	−20.8982
8	−11.1936	−6.56663	−17.7603	−10.7113	−10.3655	−21.0768
9	−11.4677	−6.41792	−17.8856	−11.1021	−10.8352	−21.9374
10	−11.8136	−6.29481	−18.1084	−11.5256	−9.98845	−21.5141