r语言 - 条件删除行:删除准相同的行，但不删除相同的行

Question

我有一个数据帧，我需要根据行中"准相同"的两个值对其进行分离。我只需要删除不同但不相同的观察结果。我尝试使用agrep，但此函数也删除相同的观察值。

Id<-c("RoLu1976","Rolu1976","RoLu1976","AlBl1989","ThSa1996")
Art<-c("Econometric Policy Evaluation: A Critique","Econometric Policy Evaluations A Critique","Econometric Policy Evaluation: A Critique", "Rules after discretion", "Expectations and the Nonneutrality of Lucas")
Id.1<-c("FiKy1989","FiKy1989","BeBe1983","JoSt1989","JoSt1990")
Art.1<-c("Notes on the Lucas Critique","Notes on the Lucas Critique","The Inconsistency of Optimal Plans","The Inconsistency","Notes on the Lucas")
N<-data.frame(Id,Art,Id.1,Art.1)

上述dataframe的准相同值在前两次观测的Art列中，仅s和:不同。

在上面的例子中，最终的数据帧应该是(注意没有删除相同的值):

Id        Art                                          Id.1       Art.1
RoLu1976  Econometric Policy Evaluation: A Critique    FiKy1989   Notes on the Lucas Critique
RoLu1976  Econometric Policy Evaluation: A Critique    BeBe1983   The Inconsistency of Optimal Plans
AlBl1989  Rules after discretion                       JoSt1989   The Inconsistency
ThSa1996  Expectations and the Nonneutrality of Lucas  JoSt1990   Notes on the Lucas

我所做的是:

yy = NULL
for(i in 1:length(N$Art)){
  temp = agrep(N[i,"Art"],N$Art,value=T)
  y = ifelse(any(N[i,"Art"]==temp),temp[1],N[i,"Art"])
  yy = c(yy,y)
}
N$Art = yy
N.2 = N[!duplicated(N$Art), ]

但是它删除了两个值:相同的和准相同的。

我该怎么做?

Answer 1

您可以将相同内容的索引存储在原始Art列中，并将其与重复数据删除后的结果结合使用，例如

originallyDuplicated <- duplicated(N$Art)
# then run your snippet to generate `yy`

所以你想摆脱那些重复的东西现在，但不是原来。

N[!(duplicated(yy) & !originallyDuplicated),]

虽然对我来说，似乎不是基于你的排除标准纯粹的Art列，如果每列在行复制(或几乎复制)表的其他地方排除一行更有意义。(例如，比较Art.1, ID .1, ID等栏?)