Displaying 1 result from an estimated 1 matches for "therealjimshady".
2012 Nov 22
4
Using cumsum with 'group by' ?
Hi,
First post here. Grateful for any help you can give. I have data which looks
like this:
id time x
1 12:01 5
1 12:02 14
1 12:03 6
1 12:04 3
2 12:01 98
2 12:02 23
2 12:03 1
2 12:04 4
3 12:01 5
3 12:02 65
3 12:03 23
3 12:04 23
But I want to add a column which is the cumulative sum of X, but only by id.
I've used cumsum before, but not