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Re: st: Find the fiscal year for each obs
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Find the fiscal year for each obs
Date
Sat, 6 Apr 2013 12:50:07 +0100
I'd just -merge- the files. The convention seems to be that Fiscal
Years are labelled by the year they start in. (It's _always_ a good
idea to explain stuff that won't be universally understood; assuming
that people work in your field is usually wrong.) Either way, there's
a correction for dates that are in calendar years that differ from
fiscal years. This example uses slightly different fake data. I used
an ancient -merge- only because I am writing from an ancient machine.
(I have Stata 12, but this machine doesn't read DVDs.)
clear
input str3 Firm str10 Date
IBM "2009/01/15"
IBM "2010/01/16"
3M "2010/07/01"
3M "2011/07/02"
end
gen Ndate = date(Date, "YMD")
gen Fiscal = year(Ndate)
sort Firm Fiscal
save FileA, replace
clear
input str3 Firm Fiscal str10 Begin str10 End
IBM 2009 "2009/03/01" "2010/02/28"
IBM 2010 "2010/03/01" "2011/02/28"
3M 2010 "2010/06/01" "2011/05/31"
3M 2011 "2011/06/01" "2012/05/31"
end
gen Nbegin = date(Begin, "YMD")
gen Nend = date(End, "YMD")
sort Firm Fiscal
version 10: merge Firm Fiscal using FileA
replace Fiscal = Fiscal - 1 if !inrange(Ndate, Nbegin, Nend)
drop _merge
list Firm Fiscal Begin End Date
Nick
[email protected]
On 6 April 2013 12:15, Yu Chen, PhD <[email protected]> wrote:
> I have two files. File A contains the daily stock price for each firm,
> and file B contains the beginning and ending dates for a fiscal year
> for each firm. See below for an illustration (data are hypothetical):
>
> File A:
> Firm Date Price
> IBM 2009/01/15 xxxx
> IBM 2009/01/16 xxxx
> ...................
> 3M 2010/07/01 yyyy
> 3M 2010/07/02 yyyy
> ...................
>
> File B:
> Firm Fiscal Year Beg. Date End. Date
> IBM 2009 2009/03/01 2010/02/28
> IBM 2010 2010/03/01 2011/02/28
> ..................
> 3M 2010 2010/06/01 2011/05/31
> 3M 2011 2011/06/01 2012/05/31
> ..................
>
> Now, I want indicate in File A for each observation the fiscal year
> the observation belongs to, according to the definition in File B.
> Conceptually it seems easy: Just compare the date of the observation
> in File A with the beginning and ending dates in File B.
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