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st: wide to long


From   "ALICE DOBSON" <alice_dobson@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: wide to long
Date   Thu, 19 Oct 2006 10:56:46 -0400

Hi David, thanks for the response. I transfered each individual variable
file to State using Stat transfer. I renamed the variable using a prefix.
However, when I try:

reshape long totistam, i(firmid) j(year)

I get the following message:

year contains all missing values
r(498);

Could anybody please tell me what's going on? I also tried - mvencode - to
replace missing values with 0 but that did not help either.
Best,
alice


Start by Stat/Transferring these into Stata.

But your column names of  "1985", "1986" , etc. will get rendered as, I
believe, "_1985", "_1986", etc..

Each of those needs to be further renamed to have a common prefix that is
distinct for the given table.  Presumably, each table is one variable, so
the prefix should correspond to that variable.  Thus, if the table is
"number of employees" you should rename the variables something like
  nemp1985, nemp1986, etc.
If your table is about revenue, then name them rev1985, rev1985, etc.

(You could, alternatively, change the column names in the Excel tables.
But in any case, for the transfer to go smoothly, the Excel tables need to
be "clean" -- have just the column names in the first row, and the data in
all subsequent rows.)

Do this for each table.
Then you will want to merge all the tables together.

Presumably you also want to -reshape wide-.  That could come before or
after the merge.

Hope this helps.
--David

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of David Kantor
Sent: 17 October 2006 14:17
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Wide to Panel


At 08:24 AM 10/17/2006, Alice Dobson wrote:
Hi all,
I have a datafile containing an unabalanced panel of firms for a period
of
around 10 years. This file contains data on around five variables. I have
procured additional data on around 15 firm-level variables for these set
of
firms. However, the problem is that each variable is in a different excel
file and that too in a wide format. I can transfer these files into stata
format using stat transfer. Could anyone please tell me if its possible
to
convert these multiple data files into one datafile in the panel format?

Each individual file for a single variable looks like this. There are 15
such files, one for each varible. The numberf of firms is too large and
hence will take a lot of time to do by hand.

FIRM     1985    1986   1987   1988   1989   1990   1991   1992   1993
1994
FIRM1   100      123      124     3001     293   324   512        413
FIRM2
FIRM3
FIRM4
:
:
:
:
FIRM1002


Best,
Alice
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