Please use STATA do-files to replicate our data analysis.

For each company, there are six do-files.  
For instance, there are six files for IHI: 
GT09030ihi 2000, GT09030ihi 2003, GT09030ihi 2004, 
GT09030ihi 2007, GT09030ihi 2008, and GT100406ihi 2010.

GT09030ihi 2000 is the do-file for the first event in January 2000. 
GT09030ihi 2003 is for the second event in December 2003.
GT09030ihi 2004 is for the third event in December 2004. 
GT09030ihi 2007 is for the forth event in May 2007. 
GT09030ihi 2008 is for the fifth event in August 2008.
GT100406ihi 2010 is for the last event in March 2010.