difference in difference graph

[Ataullah Khan]

Hi,

I intend to produce a difference in difference graph of my data such as the graph give below;



My data is here;

* Example generated by -dataex-. To install: ssc install dataex
clear
input int year byte(time treatment) float percentage
2018 0 0 .28
2020 1 0 .44
2018 0 1 .27
2020 1 1 .51
end

I have produced the following graph using the code below, but it is not the one that I want to present, and it does not have the dotted line.

Code:

reshape wide percentage, i(time) j(treatment)
graph twoway line percentage0 percentage1 year, ytitle(%) xtitle(year end) xline(2018.3) sort

Could you guys help me out producing the graph with the dotted line above.
Thanks

[Wouter Wakker]

Duplicate post answered here https://www.statalist.org/forums/for...fference-graph