----- Original Message -----
From: "Webb.Bayard" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 24, 2003 5:45 PM
Subject: st: ST: populating a variable based on a second data set
> Hi, I'm a new Stata user with a merge problem.
>
> I have one data set (call it A) with a variable that needs to be defined
in
> terms of the observations in a second data set (B). I don't know if this
can
> be done with a single command or if it needs to be programmed.
> Basically, B is a lookup table. I need to lookup the contents of an A var
in
> B, and return the value of a different B var corresponding to the same
data
> point.
>
> Thanks in advance for any suggestions.
>
> Bayard
>
>
> Example
> A =
> type
> 1 human
> 2 cat
> 3 human
> 4 dog
> 5 rat
> 6 cat
>
>
> B =
> type tail
> 1 human 0
> 2 cat 1
> 3 dog 1
> 4 rat 1
>
>
> AFTER OPERATION
> A =
> type tail
> 1 human 0
> 2 cat 1
> 3 human 0
> 4 dog 1
> 5 rat 1
> 6 cat 1
-joinby- might be what you need.
. use "C:\DATA\foo1.dta", clear
. l
+-------+
| type |
|-------|
1. | human |
2. | cat |
3. | human |
4. | dog |
5. | rat |
|-------|
6. | cat |
+-------+
. joinby type using c:\data\foo2.dta
. l
+--------------+
| type tail |
|--------------|
1. | cat 1 |
2. | cat 1 |
3. | dog 1 |
4. | human 0 |
5. | human 0 |
|--------------|
6. | rat 1 |
+--------------+
Hope this helps,
Scott
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