将 NA 值转换为 ?加载时自动 [英] Convert NA values to ? automatically while loading
问题描述
有没有办法自动将 NA 值转换为 ?在加载 .csv 文件时在 weka 中?或者我们是否必须使用其他脚本/程序来替换它们?或加载到weka之前的空白区域.
Is there a way to automatically convert NA values to ? in weka while loading .csv files? Or do we have to use some other script/program to either replace them with ? or a blank space before loading into weka.
欢迎任何帮助或建议.谢谢
Any help or suggestions are welcome. Thanks
推荐答案
不幸的是，我不相信 Weka 有办法进行这种转换.这是因为 Weka 的原生格式是 .arff 文件.在 .arff 文件中，缺失值用?"表示. 加载 .csv 文件时，它期望缺失值也用?"表示.
Unfortunately I do not believe Weka has a way to do this conversion. This is the case because Weka's native format is .arff files. In .arff files, missing values are denoted with a "?". When a .csv file is loaded, it expects missing values to also be denoted by "?".
根据您使用 Weka 的方法，我建议:
Depending on your method of using Weka I suggest:
对于 Weka GUI，在简单的文本编辑器中使用查找和替换"将NA"更改为?"在将 .csv 加载到 Weka 之前.
For the Weka GUI, use "find and replace" in a simple text editor to change "NA" to "?" before loading the .csv into Weka.
对于 Weka Java API，编写一个方法来预处理您的.csv"文件，然后再将它交给 Weka .csv 加载器.
For the Weka Java API, write a method to preprocess your ".csv" file before handing it over to the Weka .csv loader.
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