Table 1.

Classification results of the LDA, k-NN, and PLS-DA of the rhubarb geographical origins by using the training and validation set in the different regions.

LDA	Regions	Predicted			Total
		Gansu	Sichuan	Qinghai
Training	Gansu	15	0	1	16
	Sichuan	3	25	0	28
	Qinghai	9	2	90	101
	%, correct	93.8	89.3	89.1	89.7
Validation	Gansu	3	0	1	4
	Sichuan	2	12	3	17
	Qinghai	2	0	22	24
	%, correct	75.0	70.6	91.7	82.2
k-NN
Training	Gansu	13	0	4	17
	Sichuan	1	30	4	35
	Qinghai	1	2	90	93
	%, correct	76.5	85.7	96.8	91.7
Validation	Gansu	3	0	0	3
	Sichuan	0	6	4	10
	Qinghai	0	2	30	32
	%, correct	100.0	60.0	93.8	86.7
PLS-DA
Training	Gansu	6	1	11	18
	Sichuan	2	26	6	34
	Qinghai	4	2	87	93
	%, correct	33.3	76.5	93.6	82.1
Validation	Gansu	1	0	1	2
	Sichuan	1	8	2	11
	Qinghai	0	0	32	32
	%, correct	50.0	72.7	100.0	91.1