Research Article
Nonparametric Subgroup Identification by PRIM and CART: A Simulation and Application Study
Table 3
Proportions of cases with predicted subgroups when using one of the methods for
observations and one true subgroup.
| | | Method | 0 | 0.33 | 0.67 | 1 | 1.33 | 1.67 | 2 | 2.33 | 2.67 | 3 |
| | 5% | PRIM () | 0.1 | 0.13 | 0.28 | 0.59 | 0.86 | 0.99 | 1 | 1 | 1 | 1 | | PRIM (opt. ) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (pruned) | 0.04 | 0.04 | 0.05 | 0.16 | 0.22 | 0.34 | 0.58 | 0.8 | 0.9 | 0.94 | | CART (maxdepth) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| | 5% (margin) | PRIM () | 0.08 | 0.11 | 0.16 | 0.35 | 0.64 | 0.93 | 1 | 1 | 1 | 1 | | PRIM (opt. ) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (pruned) | 0.05 | 0.04 | 0.1 | 0.39 | 0.69 | 0.88 | 0.98 | 0.98 | 1 | 1 | | CART (maxdepth) | 0.98 | 0.99 | 0.99 | 0.99 | 1 | 1 | 1 | 1 | 1 | 1 |
| | 20% | PRIM () | 0.1 | 0.34 | 0.78 | 0.99 | 1 | 1 | 1 | 1 | 1 | 1 | | PRIM (opt. ) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (pruned) | 0.04 | 0.06 | 0.23 | 0.92 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (maxdepth) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| | 40% | PRIM () | 0.1 | 0.46 | 0.97 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | PRIM (opt. ) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (pruned) | 0.06 | 0.13 | 0.85 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | CART (maxdepth) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
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