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From |
Martijn S <martstouthart@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Creating a dummy for each large firm in each fiscal year (foreach command) |

Date |
Sun, 12 Jun 2011 18:33:51 +0200 |

Hello, This is my problem. I have a sample which uniquely identifies firms by the variable gvkey. Now I want to run a regression over firms that are defined as large and therefore I want to create a dummy. I define firms as large on basis of their 2008 total assets. As a result I created a dummy variable called largefirmdummywith the command: generate largefirmdummy=1 if fyear==2008 & at > 100. Next I entered the following command: generate gvkeylarge = gvkey if largefirmdummy==1. So I now have the variable gvkeylarge which contains the gvkey of each large firm. Suppose now, gvkeylarge contains a firm with the 'gvkey' 1166. I have this firm in my sample from 1999-2010, as is can be seen from variable gvkey which contains 12 times the gvkey 1166. So from 1999-2010 I want to create a dummy which has a value of 1 in for this firm. This can be done by the following command: replace largefirmdummy=1 if gvkey==1166 replace largefirmdummy=1 if gvkey==8071 replace largefirmdummy=1 if gvkey==8546 etc.... Thus I want to create a loop which looks at every unique number if gvkeylarge, than looks at looks at the variable gvkey if it containts this unique number, and when this is the case the loop must add a 1 to the variable largefirmdummy. I tried the foreach command but I cannot get this working. I hope that someone can help me out. Thanks, Martijn . * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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