争吵 问答列表
作者：Peter.2055 提问时间：6/16/2023
我有一个大的数据帧，我需要过滤和计算一些汇总统计量，df 如下所示： ID<-c("KMT1","KMT1","KMT1","KMT2","KMT2","KMT2","KMT3","KMT3","K...