测量预测器的性能
训练预测器预测给定若干邻居特性的波士顿社区的财产中位数.
| In[1]:= |  X |
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获取基于测试集的预测器性能数据.
| In[2]:= |  X |
| Out[2]= |  |
比较实际值和预测值.
| In[3]:= |  X |
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绘制残差.
| In[4]:= |  X |
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从实际值计算预测值的标准偏差（残差均方根）.
| In[5]:= |  X |
| Out[5]= |  |
绘制残差直方图.
| In[6]:= |  X |
| Out[6]= |  |
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