Hello, I am using local projection method, and my data is panel fixed effect ,
I have two questions :
1)my data is from 1996 till 2019 and effect of uncertainty on fertility. when I generate the dummy variable for the time of financial crises 2008 ,and I run the regression my result is zero .
I don't know why this happens?
gen dummy=0
replace dummy=1 if year==2008
2)I know in fixed effect we can use vce(cluster I.country) to robustness,
but if I want to check the robustness what should I do ? When I use XTTEST3, it is not possiable.

Many thanks , I hope you help me .
many thanksss