使用自带的ｖｏｔｅ数据集：
实验结果如下：
剪枝前：
physician fee freeze = n:
| adoption of the budget resolution = y: democrat (151.0)
| adoption of the budget resolution = u: democrat (1.0)
| adoption of the budget resolution = n:
| | education spending = n: democrat (6.0)
| | education spending = y: democrat (9.0)
| | education spending = u: republican (1.0)
physician fee freeze = y:
| synfuels corporation cutback = n: republican (97.0/3.0)
| synfuels corporation cutback = u: republican (4.0)
| synfuels corporation cutback = y:
| | duty free exports = y: democrat (2.0)
| | duty free exports = u: republican (1.0)
| | duty free exports = n:
| | | education spending = n: democrat (5.0/2.0)
| | | education spending = y: republican (13.0/2.0)
| | | education spending = u: democrat (1.0)
physician fee freeze = u:
| water project cost sharing = n: democrat (0.0)
| water project cost sharing = y: democrat (4.0)
| water project cost sharing = u:
| | mx missile = n: republican (0.0)
| | mx missile = y: democrat (3.0/1.0)
| | mx missile = u: republican (2.0)
对应的图形为:
剪枝后：
physician fee freeze = n: democrat (168.0/2.6)
physician fee freeze = y: republican (123.0/13.9)
physician fee freeze = u:
| mx missile = n: democrat (3.0/1.1)
| mx missile = y: democrat (4.0/2.2)
| mx missile = u: republican (2.0/1.0)
完全对应书上Ｐ38-39的结果
