在R中创建唯一的随机组ID

问题描述

我正在尝试创建一个唯一的，随机分配的（无替换）组ID，而不使用for循环。据我所知：

I am trying to create a unique, randomly assigned (without replacement) group id without using a for loop. This is as far as I got:

library(datasets)
library(dplyr)

data(iris)

iris <- iris  %>% group_by(Species) %>% mutate(id = cur_group_id())

这给我每个虹膜$种的组ID，但是，我希望组ID是从c（1,2,3）随机分配的，而不是分配的根据数据集的顺序。

This gives me a group id for each iris$Species, however, I would like the group id to randomly assigned from c(1,2,3) as opposed to assigned based on the order of the dataset.

任何帮助创建该对象的方法都将非常有帮助！我相信有办法用dplyr做到这一点，但我很困惑...

Any help creating this would be very helpful! I am sure there is a way to do this with dplyr but I am stumped...

推荐答案

也许您可以玩一些技巧在 group_by 上通过添加 sample 操作，例如

Maybe you can play some tricks on group_by by adding sample operation, e.g.,

iris <- iris %>%
  group_by(factor(Species, levels = sample(levels(Species)))) %>%
  mutate(id = cur_group_id())

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