Hello everyone, I am a student at a university and i am very new to DID analysis.
The purpose of my research was to see the impact of an anti-dumping policy applied to several countries on import volumes.
I have 7 countries to research and the data is taken from 2014-2018

Here are some of the information i have

4 Control group: countries that do not receive treatment /ADpolicy (non-named countries)
3 Treatment group: countries receiving treatment / ADpolicy (named countries)

The data were taken from 2014 to 2018.
With a note that 2014 and 2015 are before treatment and
2016,2017, and 2018 are during treatment

1. Is the arrangement of my data already correct?

Array

2. I saw some posts on statalist and tried to take the following actions.Is this correct to explain the impact of the policy on import volume?

i used code:
xtset country
xtreg volimpor i.treated##i.time, fe vce(robust)
im sorry, fyi i don't know how to decide use random effect or fixed effect.

3. With that code above i have this but i don't know how to interpret the result

Array

Could you teach me how to solved that problem ?
Thank you and have a nice day everyone