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> print(model)n= 68 node), split, n, deviance, yval * denotes terminal node1) root 68 72049750.0 1051.1520 2) x2< 21759.15 48 6881635.0 478.8652 4) x2< 9920.71 31 736981.7 247.5813 * 5) x2>=9920.71 17 1462508.0 900.6182 * 3) x2>=21759.15 20 11718150.0 2424.6400 6) x2< 42085.99 13 1467165.0 1958.6830 * 7) x2>=42085.99 7 2186680.0 3289.9890 *
> summary(model)Call:rpart(formula = y ~ ., data = Data1_train, method = "anova") n= 68 CP nsplit rel error xerror xstd1 0.74184807 0 1.00000000 1.0358085 0.202789762 0.11192687 1 0.25815193 0.3265755 0.073796943 0.06498489 2 0.14622506 0.2998811 0.059809724 0.01000000 3 0.08124017 0.2437445 0.05804903Variable importance x2 x13 x1 x15 x11 x16 x3 x6 x7 x8 19 17 16 14 13 13 3 2 2 1 Node number 1: 68 observations, complexity param=0.7418481 mean=1051.152, MSE=1059555 left son=2 (48 obs) right son=3 (20 obs) Primary splits: x2 < 21759.14 to the left, improve=0.7418481, (0 missing) x11 < 10843.62 to the left, improve=0.7385662, (0 missing) x13 < 6012.35 to the left, improve=0.7351267, (0 missing) x1 < 33868.23 to the left, improve=0.7196785, (0 missing) x15 < 1665.815 to the left, improve=0.7147013, (0 missing) Surrogate splits: x13 < 7030.545 to the left, agree=0.985, adj=0.95, (0 split) x1 < 33868.23 to the left, agree=0.971, adj=0.90, (0 split) x11 < 10843.62 to the left, agree=0.971, adj=0.90, (0 split) x15 < 1665.815 to the left, agree=0.971, adj=0.90, (0 split) x16 < 1675.575 to the left, agree=0.956, adj=0.85, (0 split)Node number 2: 48 observations, complexity param=0.06498489 mean=478.8652, MSE=143367.4 left son=4 (31 obs) right son=5 (17 obs) Primary splits: x2 < 9920.71 to the left, improve=0.6803827, (0 missing) x1 < 11951.67 to the left, improve=0.6674938, (0 missing) x8 < 463.99 to the left, improve=0.6541561, (0 missing) x13 < 3268.28 to the left, improve=0.6229007, (0 missing) x15 < 794.645 to the left, improve=0.6055114, (0 missing) Surrogate splits: x1 < 11951.67 to the left, agree=0.958, adj=0.882, (0 split) x3 < 8.4 to the left, agree=0.917, adj=0.765, (0 split) x13 < 3013.85 to the left, agree=0.917, adj=0.765, (0 split) x15 < 700.805 to the left, agree=0.917, adj=0.765, (0 split) x8 < 305.85 to the left, agree=0.896, adj=0.706, (0 split)Node number 3: 20 observations, complexity param=0.1119269 mean=2424.64, MSE=585907.4 left son=6 (13 obs) right son=7 (7 obs) Primary splits: x2 < 42085.99 to the left, improve=0.6881892, (0 missing) x13 < 13104.1 to the left, improve=0.6881892, (0 missing) x7 < 24542.87 to the left, improve=0.6686660, (0 missing) x11 < 19498.24 to the left, improve=0.6686660, (0 missing) x15 < 3545.47 to the left, improve=0.6686660, (0 missing) Surrogate splits: x13 < 13104.1 to the left, agree=1.00, adj=1.000, (0 split) x3 < 30.455 to the left, agree=0.95, adj=0.857, (0 split) x1 < 67920.46 to the left, agree=0.90, adj=0.714, (0 split) x6 < 77.4 to the right, agree=0.90, adj=0.714, (0 split) x7 < 22724.44 to the left, agree=0.90, adj=0.714, (0 split)Node number 4: 31 observations mean=247.5813, MSE=23773.6 Node number 5: 17 observations mean=900.6182, MSE=86029.9 Node number 6: 13 observations mean=1958.683, MSE=112858.8 Node number 7: 7 observations mean=3289.989, MSE=312382.8
这样的结果是对的吗?还是我程序写的有问题?
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