. list
+------------+
| id etime |
|------------|
1. | 15 0 |
2. | 15 6 |
3. | 15 2 |
4. | 20 10 |
5. | 20 30 |
|------------|
6. | 20 4 |
+------------+
. bysort id: gen cumfreq = sum(etime)
. list
+----------------------+
| id etime cumfreq |
|----------------------|
1. | 15 0 0 |
2. | 15 6 6 |
3. | 15 2 8 |
4. | 20 10 10 |
5. | 20 30 40 |
|----------------------|
6. | 20 4 44 |
+----------------------+
.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Raphael
Fraser
Sent: Thursday, May 11, 2006 1:32 PM
To: [email protected]
Subject: st: Computing a cumulative frequency variable
I have the following variables and would like to generate or compute
the cumulative frequency of etime. The end result should look like
this:
id etime cum. freq
15 0 0
15 6 6
15 2 8
20 10 10
20 30 40
20 4 44
Raphael
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