Dear all,
I would like to sort the values of "member" for each group, and obtain a
variable to indicate its rank within the group.
For example, we have original dataset as follows:
df <- data.frame(group = c(rep(1, 3), rep(5, 3)),
member = c(30, 10, 22, 21, 44, 15))
group member
1 1 30
2 1 10
3 1 22
4 5 21
5 5 44
6 5 15
After sorting the variable "member", we want the dataset like this:
group member order
1 1 30 3
2 1 10 1
3 1 22 2
4 5 21 2
5 5 44 3
6 5 15 1
I already searched the R helper archives, but failed to find the proper
answers.
Could you please kindly give me some suggestions, except using loop because
of larger sample size? Thanka a lot.
Best regards,
Zhen Zhang
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