Random forest package in R shows error during prediction() if there are new factor levels present in test data. Is there any way to avoid this error?
随机森林包R显示在预测误差（）如果有新因素水平出现在测试数据。有什么方法可以避免这个错误?。
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There were still weaknesses in the package - and engine power remained a factor - but now Alonso could sense the improvement, so too he seemed to lift his own game.
The method for prediction the meter factor of the turbine flow meter by the computational fluid dynamics (CFD) software package (FLUENT) is put forward.