If I want to select a subset of data in R, I can use the subset function. I wanted to base an analysis on data that that was matching one of a few criteria, e.g. that a certain variable was either 1, 2 or 3. I tried If I want to select a subset of data in R, I ca
阅读背景：
在子集函数和逻辑运算符中使用多个条件
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