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Re: st: Generating a value depending on filename


From   Jeph Herrin <stata@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generating a value depending on filename
Date   Tue, 03 Dec 2013 20:53:25 -0500

You can get the file list, and append at the same time:

  local files : dir . files *_labor_vars.xls
  clear
  save states, emptyok replace
  foreach F in `files' {
	local state = substr("`F'",1,2)
	import excel `F', sheet("BLS Data Series") firstrow
	gen str2 state="`state'"
	append using states
	save states, replace
 }

If you want to add a FIPS state code later, just use a cross walk to match to the -state- variable.

hope this helps,
Jeph


On 12/3/2013 4:24 PM, Jack Newsham wrote:
Hi all,

I'm working with state-by-state employment data on 51 Excel
spreadsheets that I plan to eventually append together and merge into
my main project file. Each spreadsheet is organized in columns
containing the year, month, and several measures of employment, with
only the name of the spreadsheet identifying the state whose data it
contains. I am attempting to create two variables -- "time" and
"state" -- to merge these data into my main file.

I'm somewhat of a Stata naif, however, and I'm running into a problem
when I try to generate "state" and give it a different value in every
spreadsheet. My use of  "if filename ==" and "if using" seem to be the
source of the problem, but I can't imagine how to generate a state
variable with a different value in each file. I've excerpted from my
do file, in relevant part. Can you advise? Is there a way to do this
in a loop? My thanks for any pointers.

foreach initials in AK AL AR AZ CA {
* The clear command is at the end of this loop.
import excel `initials'_labor_vars.xls, sheet("BLS Data Series") firstrow
* Create time variable by which to merge:
encode period,gen(monthnum)
gen time = (year * 100) + monthnum
* Create state variable by which to merge:
gen state = 01 if filename == "AL_labor_vars.xls" | 02 if filename ==
"AK_labor_vars.xls" |  ///
04 if filename == "AZ_labor_vars.xls" | 05 if filename ==
"AR_labor_vars.xls" | ///
06 if filename == "CA_labor_vars.xls"
}

Best,
Jack Newsham
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