Hi,

I have a hand-collected dataset regarding a specific negotiation event (data listed below). This negotiation data only covers some manufacturing firms (since it is very time-consuming to hand collect data). I want to merge this dataset to my main data which covers all kinds of firms to conduct a difference-in-difference test. I can merge these two data by gvkey and year. Could you please let me know how to do this DID analysis?

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input int year long gvkey float Eventdummy
2004 1225 1
2009 1225 1
2014 1225 1
2019 1225 1
2018 1230 1
2004 1240 1
2008 1240 1
2013 1240 1
2015 1240 1
2011 1279 1
2005 1300 1
2006 1300 1
2007 1300 1
2017 1300 1
2001 1356 1
2006 1356 1
2011 1429 1
2007 1526 1
2010 1526 1
2015 1526 1
2004 1567 1
2006 1567 1
2010 1567 1
2005 1742 1
2010 1742 1
2003 2136 1
2004 2136 1
2005 2136 1
2006 2136 1
2007 2136 1
2008 2136 1
2010 2136 1
2013 2136 1
2003 2285 1
2005 2285 1
2008 2285 1
2012 2285 1
2014 2285 1
2006 2393 1
2003 2663 1
2005 2663 1
2006 2663 1
2007 2663 1
2005 2783 1
2005 2784 1
2008 2784 1
2004 2817 1
2005 2817 1
2011 2817 1
2017 2817 1
2005 3036 1
2000 3362 1
2003 3362 1
2006 3362 1
2010 3362 1
2004 3392 1
2004 3413 1
2005 3422 1
2008 3502 1
2010 3502 1
2006 3532 1
2007 3532 1
2010 3532 1
2004 3650 1
2010 3708 1
2003 3734 1
2005 3734 1
2004 3835 1
2007 3835 1
2009 3835 1
2010 3835 1
2015 3835 1
2013 3897 1
2003 3980 1
2007 3980 1
2003 4062 1
2007 4503 1
2004 4798 1
2011 4798 1
2013 4798 1
2007 4839 1
2008 4839 1
2011 4839 1
2006 5046 1
2008 5046 1
2014 5046 1
2007 5047 1
2019 5047 1
2003 5073 1
2007 5073 1
2006 5134 1
2005 5135 1
2016 5135 1
2004 5151 1
2008 5151 1
2012 5151 1
2006 5234 1
2007 5518 1
2010 5597 1
2007 5709 1
end