Table 18 The performance for PSO algorithm with population 30 and the last situation Preprocessing 3.

From: Open source Arabic research paper dataset for natural language processing

# K and iteration

Silhouette coefficient (euclidean)

Silhouette coefficient (cosine)

ARI

Davies–Bouldin Index

k = 6, iteration = 100

0.030

0.056

0.364

5.681

k = 6, iteration = 50

0.029

0.055

0.364

5.681

k = 6, iteration = 30

0.030

0.056

0.364

5.681

k = 4, iteration = 100

0.027

0.052

0.177

5.799

k = 4, iteration = 50

0.026

0.051

0.177

5.799

k = 4, iteration = 30

0.027

0.052

0.177

5.799

k = 5, iteration = 100

0.026

0.049

0.307

5.931

k = 5, iteration = 50

0.026

0.049

0.306

5.930

k = 5, iteration = 30

0.026

0.049

0.307

5.931