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Table 2 The detected accuracies of multiclass SVM testing and the conventional epoch-average method in the classification study

From: Improvement of classification accuracy in a phase-tagged steady-state visual evoked potential-based brain computer interface using multiclass support vector machine

Subject index Multiclass SVM-based method    The conventional epoch-average method (detection interval = 0.7 sec)
  Accuracies for each class (Numcorrect/Numtotal) Averaged accuracies (Numcorrect/Numtotal) Averaged effective epoch lengths (s)  
  Class I Class II Class III Class IV    
1 97.62% 98.18% 94.23% 94.55% 96.08% 0.59 82.62%
(41/42) (54/55) (49/52) (52/55) (196/204)
2 97.96% 96.00% 91.30% 93.62% 94.79% 0.63 78.06%
(48/49) (48/50) (42/46) (44/47) (182/192)
3 97.56% 88.68% 90.38% 91.49% 91.71% 0.62 65.82%
(40/41) (47/53) (47/52) (43/47) (177/193)
4 95.56% 100% 94.34% 97.37% 96.79% 0.64 67.86%
(43/45) (51/51) (50/53) (37/38) (181/187)
5 94.59% 92.59% 91.38% 93.62% 92.86% 0.61 77.38%
(35/37) (50/54) (53/58) (44/47) (182/196)
6 94.87% 97.50% 95.45% 93.02% 95.18% 0.72 64.29%
(37/39) (39/40) (42/44) (40/43) (158/166)
7 91.43% 93.48% 97.73% 93.35% 94.64% 0.71 75.00%
(32/35) (43/46) (43/44) (41/43) (159/168)
8 94.59% 87.18% 82.50% 85.00 87.18% 0.77 80.40%
(35/37) (34/39) (33/40) (34/40) (136/156)
9 91.49% 96.15% 93.02% 97.83% 94.68% 0.64 70.92%
(43/47) (50/52) (40/43) (45/46) (178/188)
10 93.62% 88.64% 84.44% 92.86% 89.89% 0.67 68.39%
(44/47) (39/44) (38/45) (39/42) (160/178)
11 89.13% 90.48% 95.00% 87.50% 90.34% 0.68 66.33%
(41/46) (38/42) (38/40) (42/48) (159/176)
12 92.86% 91.67% 91.38% 90.20% 91.46% 0.60 71.94%
(39/42) (44/48) (53/58) (46/51) (182/199)
13 92.31% 93.18% 85.71% 94.00% 91.28% 0.62 73.98%
(48/52) (41/44) (42/49) (47/50) (178/195)
14 100% 91.49% 95.24% 87.50% 93.33% 0.67 65.31%
(43/43) (43/47) (40/42) (42/48) (168/180)
15 95.56% 89.80% 98.11% 100% 95.92% 0.61 63.78%
(43/45) (44/49) (52/53) (49/49) (188/196)
16 95.35% 98.00% 100% 97.50% 97.70% 0.69 68.88%
(41/43) (49/50) (41/41) (39/40) (170/174)
17 100% 91.30% 90.70% 95.12% 94.12% 0.71 74.49%
(40/40) (42/46) (39/43) (39/41) (160/170)
18 93.62% 100% 91.11% 87.76% 92.90% 0.66 72.96%
(44/47) (42/42) (41/45) (43/49) (170/183)
19 93.33% 92.45% 93.33% 97.67% 94.09% 0.65 60.71%
(42/45) (49/53) (42/45) (42/43) (175/186)
20 98.08% 91.11% 91.84% 97.78% 94.76% 0.63 64.80%
(51/52) (41/42) (45/49) (44/45) (181/191)
  Average (mean ± SD) 93.49 ± 2.58% 0.66 ± 0.05 70.70 ± 6.06%