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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 19:51:40 +0000 |

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. * * 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/

**Follow-Ups**:**Re: st: dividend programming question***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: dividend programming question***From:*"Khieu, Hinh" <Hdkhieu@usi.edu>

**Re: st: dividend programming question***From:*Nick Cox <njcoxstata@gmail.com>

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