Table 12. Estimates of regression coefficients for binary compressive strength (Y3), with standard error in parentheses.
| Variable | IWC | UWC | ||
|---|---|---|---|---|
| SCAD | LASSO | SCAD | LASSO | |
| X1 | 0.0378 | 0.0448 | 0.0336 | 0.0431 |
| (0.0108) | (0.0463) | (0.0004) | (0.0039) | |
| X2 | 0.0055 | 0.0077 | 0.0018 | 0.0057 |
| (0.0045) | (0.0108) | (0.0000) | (0.0016) | |
| X3 | 0.0403 | 0.0471 | 0.0356 | 0.0451 |
| (0.0097) | (0.0430) | (0.0003) | (0.0037) | |
| X4 | -0.0361 | -0.0483 | -0.0292 | -0.0416 |
| (0.0277) | (0.0410) | (0.0007) | (0.0091) | |
| X5 | – | – | – | – |
| – | – | – | – | |
| X6 | -0.0089 | -0.0104 | -0.0082 | -0.0098 |
| (0.0002) | (0.0008) | (0.0000) | (0.0001) | |
| X7 | – | 0.0012 | – | – |
| – | (0.0009) | – | – | |