Table 1.
Sources of (dis)agreement for the CH4 concentration and number of peaks.
| Item | CH4 Concentration in (ppm) | Number of Peaks | ||
|---|---|---|---|---|
| NDIR | LMD_cal | NDIR | LMD_cal | |
| LSMean (SE) | 1280 (88.3) a | 991 (57.3) b | 4.24 (0.1) a | 4.69 (0.1) b |
| Between-cow variation | 149081 a | 54556 b | 0.18 | 0.19 |
| Within-cow variation | 352398 a | 187742 b | 1.16 a | 0.76 b |
| Repeatability | 0.42 | 0.23 | 0.14 | 0.20 |
| Repeat measures correlation | 0.98 | 1.00 | ||
| Individual level correlation | 0.94 | 1.00 | ||
| Pearson correlation | 0.73 | 0.72 | ||
| Spearman correlation | 0.74 | 0.72 | ||
| Concordance correlation coefficient | 0.62 | 0.66 | ||
| Coefficient of individual agreement | 0.83 | 0.77 | ||
NDIR: Non-dispersive infrared CH4 sensor; LMD_cal: Laser CH4 detector transformed to ppm; SE: Standard error; estimates with subscripts differ (p < 0.05).