Alternate Low-Rank Matrix Approximation in Latent Semantic Analysis

Table 8

Average precision, recall, and total numbers of documents returned for various relative cosine threshold values for the TIME collection.

Cosine threshold	SVD			TULVD
	Recall	Precision	Number of documents returned	Recall	Precision	Number of documents returned
0.1	88.6	12.4	58.4	82.5	22.5	37.5
0.2	82.4	17.2	46.6	71.8	34.4	20.2
0.3	73.5	26.9	25.6	59.1	40.1	12.8
0.4	68.3	37.7	16.3	49.9	51.7	8.1
0.5	63.2	49.8	10.8	40.0	56.8	5.5
0.6	54.1	63.2	7.1	32.8	66.3	4.8
0.7	43.8	72.3	4.8	32.7	67.5	3.0
0.8	40.6	76.6	4.0	27.6	71.6	2.5
0.9	0.0	0.0	0.0	0.0	0.0	0.0