Nonnegative Matrix Factorization-Based Spatial-Temporal Clustering for Multiple Sensor Data Streams

Table 3

Comparison of the ACC and NMI results for the four methods on PeMS with different time steps.

Time step	ACC				NMI
	𝐾-means	Ncut	NMF	STClu	𝐾-means	Ncut	NMF	STClu
1	0.2671	0.3033	0.3262	0.5052	0.2796	0.3085	0.3248	0.5052
2	0.2777	0.3157	0.3340	0.5053	0.2908	0.3184	0.3276	0.5065
3	0.2805	0.3102	0.3057	0.5100	0.2895	0.3019	0.3279	0.5477
4	0.2716	0.3074	0.2753	0.5083	0.2838	0.2856	0.3162	0.5323
5	0.2744	0.3054	0.3303	0.5140	0.2842	0.3115	0.3165	0.5836
6	0.2782	0.3090	0.3104	0.5028	0.2878	0.3035	0.3193	0.4839
7	0.2823	0.3263	0.3283	0.5077	0.2983	0.3208	0.3214	0.5277
8	0.2779	0.3275	0.2845	0.5091	0.2967	0.2999	0.3069	0.5395
9	0.2576	0.3409	0.3810	0.5027	0.2881	0.3796	0.3346	0.4834
10	0.2480	0.3256	0.3627	0.5086	0.2779	0.3759	0.3423	0.5350
11	0.2390	0.3118	0.3471	0.5072	0.2698	0.3678	0.3245	0.5227
12	0.2305	0.2989	0.3315	0.5120	0.2637	0.3656	0.3445	0.5653
Average	0.2654	0.3152	0.3264	0.5077	0.2842	0.3283	0.3255	0.5277