Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Find the fiscal year for each obs


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
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
njcoxstata@gmail.com


On 6 April 2013 12:15, Yu Chen, PhD <profyuchen@gmail.com> 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.
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index