阅读背景:

R从不同的数据帧访问值取决于ID值和项目,并将列追加到第一个数据帧

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I am looking for a way to solve the following question: My first dataframe contains ratings, e.g., two subjects (subject ID 1 and 2) rate two items on a discrete scale. I am looking for a way to solve the following q




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