Hi,

I estimated SYS-GMM model with time dummies for different periods (like 2006-2008, 2009-2015, 2016-2018). I chose these periods after analysing patterns in my dependent variable. My dependent and independent variables are relative to Asian average. Is it good to include these time dummies - I'd like to extract trend in my data by these dummies. Is my justification correct?
What if I add to set of independent variables some variables which aren't relative to Asian average.