Data preprocessing is a critical step in the data mining as a whole process and it has vital impact on the success of a data mining project.

数据预处理在数据挖掘项目中有着举足轻重的作用，是数据挖掘整个过程的关键步骤之一。

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In case you think WNYC is spending your hard-earned contributions on a subject that flirts with frivolity and you're considering unincluding them in your estate planning, they assured me that this project was pushed into the New Year by more important data-mining efforts, on subjects such as superstorm Sandy and the recent presidential election.

WSJ: The City Unleashed