Table 2.
Medians of relative standard deviation difference of retention indices between two merging methods, linear regression transformation-based merging and simple union method. A positive value indicates that standard deviation using the linear regression transformation-based merging is smaller than that of using the simple union method. The τu and τm refer to Thompson tau based on mean and median, respectively.
| τu (%) | τm (%) | Dixon (%) | Grubbs (%) | TM (%) | ESD (%) | ||
|---|---|---|---|---|---|---|---|
| Isothermal | Non-polar | 0.4 | 0.8 | 0.7 | 0.7 | 0.0 | 1.0 |
| Semi non-polar | 0.7 | 0.9 | 0.5 | 0.6 | 0.0 | 0.4 | |
| Polar | 8.0 | 7.8 | 7.7 | 7.7 | 0.0 | 10.0 | |
| Ramp | Non-polar | 0.2 | 0.1 | 0.2 | 0.1 | 0.0 | −0.1 |
| Semi non-polar | 0.5 | 0.4 | 0.4 | 0.4 | 0.2 | 0.5 | |
| Polar | 0.5 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | |
| Complex | Non-polar | 0.6 | 0.5 | 0.6 | 0.5 | 0.0 | 0.7 |
| Semi non-polar | 0.4 | 0.5 | 0.4 | 0.4 | 0.1 | 0.4 | |
| Polar | 0.5 | 0.5 | 0.4 | 0.4 | 0.0 | 0.2 |