Table 1 Correlation of VFAs over time applying a nonparametrical Spearman test
From: Monitoring of seven industrial anaerobic digesters supplied with biochar
TVFAs | Acetic acid | Propionic acid | Butyric acid | |||||
|---|---|---|---|---|---|---|---|---|
R2 | p-value | R2 | p-value | R2 | p-value | R2 | p-value | |
BGP1 | 0.4807 | < 0.0001**** | 0.5663 | < 0.0001**** | 0.2558 | < 0.0001**** | 1.000 | na |
BGP2 | 0.4849 | < 0.0001**** | 0.4633 | 0.0003*** | 0.5118 | < 0.0001**** | 0.3455 | 0.0001**** |
BGP3 | 0.7677 | na | 0.7617 | na | 0.7349 | na | 0.7349 | na |
BGP4 | 0.3696 | 0.1041ns | 0.1058 | 0.1967ns | 0.1627 | 0.6441ns | 1.000 | na |
BGP5 | 0.9505 | na | 0.9504 | na | 0.9456 | na | 1.000 | na |
BGP6 | 0.0350 | 0.1965ns | 0.0100 | 0.4650ns | 0.1104 | 0.0924ns | 0.0272 | 0.3847ns |
BGP7 | 0.0011 | 0.7833ns | 0.0091 | 0.9500ns | 0.0007 | > 0.9999ns | 1.000 | na |