独特的身体计数栏 [英] Unique body count column

问题描述

我正在尝试为每个唯一的人添加一个身体计数.每个人都有多个数据点.

I'm trying to add a body count for each unique person. Each person has multiple data points.

df <-  data.frame(PERSON  = c("A", "A", "A", "B", "B", "C", "C", "C", "C"),
                  Y = c(2, 5, 4, 1, 2, 5, 3, 7, 1))

这就是我想要的样子:

  PERSON Y UNIQ_CT
1      A 2       1
2      A 5       0
3      A 4       0
4      B 1       1
5      B 2       0
6      C 5       1
7      C 3       0
8      C 7       0
9      C 1       0

推荐答案

您可以使用重复项并将其取反:

You can use duplicated and negate it:

transform(df, uniqct = as.integer(!duplicated(Person)))

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