I am using the Caret package train function to fit a model and then predict to predict values on an unknown data set (which I then get feedback on so I know the quality of my predictions). I'm having problems and I'm convinced it has to do with preprocessing the unknown data.I am using the Caret package train function to
阅读背景：
对插入符号中的数据进行预处理，并对未知的数据集进行预测
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