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Re: st: [merging US industry level data]
Goodness. I've been attaching -uniqusing- to the end of the merge,
and that was creating the problem. Works fine. I'm stupid. Thanks
Michael. -sc
On Sep 29, 2006, at 9:23 AM, Michael Blasnik wrote:
...
It looks like you can just use a straight -merge- (called a many-to-
one merge, but that doesn't matter) without any reshaping or
creating some new combined variable. You certainly do not want to
append. If both datasets are sorted, you can just:
merge state year using USING
Stata may issue a warning about lack of unique identification in
the master dataset, but you can ignore that since you know that is
what you expect/intend.
Michael Blasnik
----- Original Message ----- From: "Scott Cunningham"
<[email protected]>
To: <[email protected]>
Sent: Friday, September 29, 2006 9:08 AM
Subject: Re: st: [merging US industry level data]
<snip>>
Not to butt in, but can you elaborate? I have two datasets
currently: one on health outcomes where the panel identifier is a
state variable which varies over time, and another dataset (the
master dataset) where the panel identifier is a state, race, age,
and sex specific cell that varies over time. The health data is
from 1980-2000, while the master dataset is from 1970-2000.
Originally I was using -joinby- but it was causing the master
data to drop the 1970-1979 years. So I was going back to -
merge-, and had planned to - reshape- the data down to a level
where the merge could occur between using and master datasets.
But are you saying here that -append- might be better, where a
dummy variable indicating the using from the master data? But
won't this just extend the length of the master data? For
instance, say the data is:
<snip>
My thought was to reshape vbl1 by sex, age and race, as I was
saying, so as to create a single state observation, and then
merging on that state using the using data. But are you saying
that it's easier to use append? Wouldn't it just add teh data to
bottom of the master data?
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