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Re: st: Assign fiscal year-end values to a specific event in time
From
miriam geringer <[email protected]>
To
[email protected]
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 <[email protected]>:
> 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
> [email protected]
>
>
> On 26 January 2014 11:51, miriam geringer <[email protected]> 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 <[email protected]>:
>>> 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
>>> [email protected]
>>>
>>>
>>> On 25 January 2014 19:19, miriam geringer <[email protected]> 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.
>>> *
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>>> * http://www.ats.ucla.edu/stat/stata/
>> *
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> *
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