R语言如何去掉dataframe中重复的数据行？

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ziyybs: 太好用啦！！！！！！！！！！！

erlang276: 这个dplyr包里真的有select_if函数吗我下的怎么没有

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2301_77176803: 为什么这个代码显示Error in Surv(time, status) : object 'status' not found In addition: Warning message: In xtfrm.data.