Table 5.
Correlation coefficients between drought yield index and common drought indices under severe drought stress
| REI | MRP | STI | GMP | MPI | DYI | TOL | SSI | SSSI | |
|---|---|---|---|---|---|---|---|---|---|
| REI | 1 | ||||||||
| MRP | 0.99 | 1 | |||||||
| MRP | <.0001 | ||||||||
| STI | 0.98 | 0.97 | 1 | ||||||
| STI | <.0001 | <.0001 | |||||||
| GMP | 0.97 | 0.97 | 0.99 | 1 | |||||
| GMP | <.0001 | <.0001 | <.0001 | ||||||
| MPI | 0.88 | 0.89 | 0.92 | 0.92 | 1 | ||||
| MPI | <.0001 | <.0001 | <.0001 | <.0001 | |||||
| DYI | −0.86 | −0.88 | −0.88 | −0.92 | −0.71 | 1 | |||
| DYI | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | ||||
| TOL | −0.69 | −0.67 | −0.67 | −0.67 | −0.33 | 0.80 | 1 | ||
| TOL | <.0001 | <.0001 | <.0001 | <.0001 | 0.0385 | <.0001 | |||
| SSI | −0.90 | −0.90 | −0.90 | −0.90 | −0.68 | 0.93 | 0.91 | 1 | |
| SSI | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | ||
| SSSI | −0.90 | −0.90 | −0.90 | −0.90 | −0.68 | 0.93 | 0.91 | 1 | 1 |
| SSSI | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 | <.0001 |
REI = relative efficiency index, MRP = mean relative performance, STI = stress tolerance index, GMP = geometric mean productivity, MPI = mean productivity index. DYI = drought yield index, TOL = tolerance index, SSI = stress susceptibility index, SSSI = Schneider’s stress severity index (modified).
In each cell, the number on top is the correlation coefficient and the number below is the p-value of observing the corresponding correlation coefficient.