BMC Ecology and Evolution

Table 2 Correlation test among predictors

From: Quantifying predictors for the spatial diffusion of avian influenza virus in China

TR	1	2	3	4	5	6	7	8	9	10
1 Poultry dens		0.96	−0.3	−0.84	0.7	0.66	0.28	0.89	0.98	0.91
2 Farm market			−0.18	−0.69	0.65	0.67	0.39	0.93	0.97	0.87
3 Forest Volume				0.62	−0.02	0.35	0.7	−0.32	−0.28	−0.21
4 Nature reserve					−0.65	−0.26	0.08	−0.76	−0.8	−0.73
5 Temperature						0.52	0.65	0.6	0.76	0.82
6 Humidity							0.69	0.36	0.65	0.77
7 Water resource								0.2	0.37	0.48
8 Human dens									0.9	0.7
9 Transportation										0.94
10 Sample size
ED	1	2	3	4	5	6	7	8	9	10
1 Poultry dens		0.45	−0.319	−0.38	0.21	0.03	−0.12	0.63	0.86	0.6
2 Farm market			−0.25	−0.37	0.41	0.49	−0.08	0.87	0.22	0.36
3 Forest Volume				0.39	0.05	0.2	0.86	−0.46	−0.11	−0.005
4 Nature reserve					−0.03	−0.11	−0.06	−0.53	−0.4	−0.57
5 Temperature						0.86	0.09	0.15	0.04	0.45
6 Humidity							0.36	0.08	0.05	0.59
7 Water resource								−0.29	0.2	0.42
8 Human dens									0.32	0.23
9 Transportation										0.79
10 Sample size

The values in the cell represent the correlation coefficient of the two predictors in the column and row, >0.5 indicates a supported positive correlation and < −0.5 indicates a supported negative correlation. The predictors which have weak correlation with others are put into the same GLM analysis, with the correlation coefficient values marked in bold

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