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| From | miriam geringer <miriam.geringer@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Assign fiscal year-end values to a specific event in time |
| Date | Mon, 27 Jan 2014 22:36:06 +0100 |
In terms of my example: Company Date Year Price Event Month* A 31Okt 1988 334 A 29Nov 1988 10 335 A 31Dez 1988 336 A 31Jan 1989 337 A 14Feb 1989 EventX 338 A 28Feb 1989 339 A 31Mar 1989 340 B B .... *Month = Numerical date variable, monthly frequency. Stata command = mofd(Date) This is my command: bysort Company (Month): replace Price = Price[_n-1] if missing(Price) >>> then 10 is spread forward until the next fiscal year-end value is available >>> Basically, the price indicates that the fiscal year ends. In our case, on 29Nov 1988, there is a price available. This means the fiscal year ends here. And this price shall now be spread forward until the next fiscal year-end arrives. >>> What I wonder now: What happens if the next fiscal year-end value (in our example 1989) is now missing? Example: Company Date Year Price Event Month* A 31Okt 1988 334 A 29Nov 1988 10 335 A 31Dez 1988 10 336 A 31Jan 1989 10 337 A 14Feb 1989 10 EventX 338 A 28Feb 1989 10 339 A 31Mar 1989 10 340 A 30Apr 1989 10 A 31May 1989 10 A 30Jun 1989 10 A 31Jul 1989 10 A 31Aug 1989 10 A 30Sep 1989 10 A 31Okt 1989 . If the price on 31 Okt 1989 (the fiscal year-end) is missing, Stata should NOT replace the missing value with the price (10) from the previous fiscal year 1988. Instead, it should remain missing. But I think my command doesn't consider this? Thanks 2014-01-26 Nick Cox <njcoxstata@gmail.com>: > That does not help me in terms of your example or explanation. > > A strategy is to "spread" values to other observations for the same > firm and then look for intersections. My Stata Journal article just > cited gives examples. > Nick > njcoxstata@gmail.com > > > On 26 January 2014 11:51, miriam geringer <miriam.geringer@gmail.com> wrote: >> I have two variables, which tell me when the fiscal year ends. >> An exact variable, e.g. 31Jul 1994 and a year variable, e.g. 1994. >> >> >> 2014-01-26 Nick Cox <njcoxstata@gmail.com>: >>> How can you tell Stata in terms of these data when fiscal years end? >>> >>> What kind of variable is -Date- (numeric or string)? Are you using >>> Stata dates (see -help dates and times-)? >>> >>> There is much discussion of technique in >>> http://www.stata-journal.com/article.html?article=dm0055 >>> >>> Nick >>> njcoxstata@gmail.com >>> >>> >>> On 25 January 2014 19:19, miriam geringer <miriam.geringer@gmail.com> wrote: >>> >>>> I have the following two datasets: >>>> >>>> 1) >>>> >>>> Company Date Year Price Event >>>> A 31Okt 1988 >>>> A 29Nov 1988 10 >>>> A 31Dez 1988 >>>> A 31Jan 1989 >>>> A 14Feb 1989 EventX >>>> A 28Feb 1989 >>>> A 31Mar 1989 >>>> B >>>> B >>>> .... >>>> >>>> Basically, there is some event going on in 1989. This event can happen >>>> in every month, on every day. I want to assign a specific value from >>>> the previous fiscal-year to the event in 1989. To be more precise, I >>>> want to assign the fiscal year-end price from fiscal year 1988 to the >>>> event which happens - in our example - on 14Feb 1989. In the end, I >>>> only need to know in what year the event happened and the >>>> corresponding price from the previous fiscal year-end. Sometimes, >>>> there is no price available in the previous fiscal year, then it >>>> should be just marked as missing value. >>>> >>>> ---- Fiscal Year-End 1988 ------- Event -------- Fiscal Year-End 1889 >>>>>>>>> Assign Fiscal Year-End 1988 to Event >>>> >>>> The fiscal year can end in every month and it is possible that, for >>>> example, the fiscal year ends on 31Jan 1989 and the event occurs on >>>> 14Feb 1989. Then the 31Jan 1989 value shall be assigned. >>>> >>>> It should be something like: >>>> If Stata finds an EventX in fiscal year 1989 of Company A, go to >>>> fiscal year 1988 and take the 1988 fiscal year-end price of Company A >>>> and assign it to the EventX in 1989. >>>> >>>> 2) The second dataset is identical. However, this time I want to >>>> assign the first available fiscal year-end value. >>>> >>>> Company Date Year Price Event >>>> A 31Okt 1988 >>>> A 29Nov 1988 >>>> A 31Dez 1988 >>>> A 31Jan 1989 >>>> A 14Feb 1989 EventY >>>> A 28Feb 1989 >>>> A 31Mar 1989 10 >>>> B >>>> B >>>> .... >>>> >>>> In this example, let's assume the year ends on 31Mar 1989 and on that >>>> date, the price is 10 (the fiscal year-end price). I want to assign >>>> this price to the row with the EventY and 14Feb. The same as in >>>> dataset 1, just the other way around. >>>> >>>> It should be something like: >>>> If Stata finds an EventY in year 1989 of Company A, take the first >>>> available fiscal year-end value (first one available after the event >>>> occured). The event can occur in February and the fiscal year can >>>> could end shortly after. Just take the next available value, no matter >>>> whether there is a calendar year shift in between or not. >>> * >>> * 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/ >> * >> * 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/ > * > * 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/ * * 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/