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RE: st: dividend programming question


From   "Khieu, Hinh" <Hdkhieu@usi.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: dividend programming question
Date   Sat, 23 Mar 2013 20:06:01 +0000

Thank you, Nick. Have a good night!

Hinh

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Saturday, March 23, 2013 2:57 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: dividend programming question

As said, do look at the -help- for -fillin-. It will help with your gaps.

Also, I am signing off for today.

Nick

On Sat, Mar 23, 2013 at 7:51 PM, Khieu, Hinh <Hdkhieu@usi.edu> wrote:
> Nick,
>
> Thanks so much for your prompt help.
>
> Here's what I meant for question #2: Let's say I have firm A and firm B below. I want to create a binary variable called Omission. Firm B has dots, but Firm A do not have any records for div paid from 1997-2001.
> FirmA                    Div paid       Omission
> 1995                     .10            0
> 1996                     .10            1
> 2002                     .15            0
> 2003                     .15            0
> 2004                     .15            0
> 2005                     .10            0
> 2006                     .10            0
> 2007                     .10            0
> 2008                     .10            0
> 2009                     .12            0
> 2010                     .12            0
> 2011                     .12            0
> 2012                     .15            0
> FirmB                 Div paid          Omission
> 1995                     .10            0
> 1996                     .10            0
> 1997            .               1
> 1998            .               1
> 1999            .               1
> 2000            .               1
> 2001            .               1
> 2002                     .15            0
> 2003                     .15            0
> 2004                     .15            0
> 2005                     .10            0
> 2006                     .10            0
> 2007                     .10            0
> 2008                     .10            0
> 2009                     .12            0
> 2010                     .12            0
> 2011                     .12            0
> 2012                     .15            0
>
> Again, I really appreciate any help here.
>
> Regards,
> Hinh
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu 
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Saturday, March 23, 2013 2:29 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: dividend programming question
>
> #1. Given
>
> firmid year dividend
>
> the first year when -dividend- > 0 is
>
> egen yearfirstpaid = min(year / (dividend > 0)), by(firmid)
>
> and so an indicator for first year is
>
> gen wasfirst = year == yearfirstpaid
>
> #2. Not clear to me. You seem to be saying both that you do and do not have observations for certain years. Please review Stata terminology:
>
> an observation is a record, case, or row (and _not_ a value)
>
> a value is the value of a variable
>
> missing values are present in the data, but missing
>
> If observations are not present in the data, they are (in my view) better called "omitted" or "not present".
>
> See -help fillin- as a first step.
>
> Nick
>
> On Sat, Mar 23, 2013 at 6:45 PM, Khieu, Hinh <Hdkhieu@usi.edu> wrote:
>
>> I have an unbalanced time series data: firm ID, year, and annual 
>> dividend amount. I want to create 2 binary variables
>>
>>
>>
>> 1/  indicating when firm A pays dividends for the first time. Firms 
>> may enter the dataset and pay div for the first time right at the 
>> first data entry (example: firm A first appears in data 1990 and pays 
>> div in 1990, and the variable should be 1 for 1990 and zero for other 
>> years. Firms may enter the data set and do not pay any div until 5 
>> years later (example: first appear in data 1990 and pay div in 1995, 
>> and dummy should be 1 for 1995 and zero for other years.) What makes 
>> it complicated is that firms may skip paying div for some years and 
>> come back starting to pay div again. The same binary variable should 
>> be 1 if the firm does not pay div for 5 years and starts repaying div 
>> in year 6 (example: first appear in data 1990 and pay div in 1995, 
>> and dummy should be 1 for 1995 and firm does not pay any div in years 
>> 1996 through 2001 and starts paying div in 2002, dummy should be zero 
>> for
>> 1996-2001 and 1 for 2002 and zero for other years.)
>>
>>
>>
>> 2/ the second dummy captures the omission of dividends above. If firm A pays div in 1995-1996, stops paying from 1997-2001, and pays again 2002 to 2013, dummy should be zero for 1995-1996, one for 1997-2001, and zero again 2002-2013. The problem is that sometimes observations for 1997-2001 are just dots, sometimes the observations are like this (year 1997-2001 are not there):
>>
>> FirmA                    Div paid
>>
>> 1995                     .10
>>
>> 1996                     .10
>>
>> 2002                     .15
>>
>> 2003                     .15
>>
>> 2004                     .15
>>
>> 2005                     .10
>>
>> 2006                     .10
>>
>> 2007                     .10
>>
>> 2008                     .10
>>
>> 2009                     .12
>>
>> 2010                     .12
>>
>> 2011                     .12
>>
>> 2012                     .15
>>
>>
>>
>> In this case, I want the omission dummy to be 1 in year 1996.
>
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