Dear everyone,

Hope you are doing well in these times!

I have a slight concern. I am evaluating the impact of a tax credits program (WFTC) on health of individuals. I am using a panel data and want to form a dependent variable that measures changes in health across time periods that i use. For instance, how the health changed in the post reform period of 2003-2009. I want to follow this approach rather than looking at health in individual years. I would be grateful if someone could tell me how to form that variable. I have been suggested to use d.health but I am not sure if that is the right way to do it. Appreciate your help!

Best wishes,
Ketan Kapoor