Luana -
It's probably not the most efficient way, but here's
a solution that's not dependent on the grades being sorted:
grade <- c(4,4,4,5,5,7,7,7,7,8,8,8,9,9,9,9,9,10,10,10)
unlist(sapply(rle(grade)$lengths,function(x)seq(1,x)))
[1] 1 2 3 1 2 1 2 3 4 1 2 3 1 2 3 4 5 1 2 3
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Wed, 1 Dec 2010, Luana Marotta wrote:
Hello fellows,
I would like to create a sequence for repeated numbers in a dataset. For
example:
ID <- c(1:20)
grade <- c(4,4,4,5,5,7,7,7,7,8,8,8,9,9,9,9,9,10,10,10)
Data:
ID Grade
1 4
2 4
3 4
4 5
5 5
6 7
7 7
8 7
9 7
(...)
I would like to create a variable "sequence":
Data:
ID Grade Sequence:
1 4 1
2 4 2
3 4 3
4 5 1
5 5 2
6 7 1
7 7 2
8 7 3
9 7 4
Any help is very much appreciate!
Thank you,
Luana Marotta
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