Hi,
I would like to plot a graph using
Code:
twoway line
and draw a different graph pattern after a certain year.
I am expecting the graph would be shaped in a solid line between 2000 and 2015. After 2015, the graphs would be like a dash line. I hope the attached image helps for understanding.

I know the
Code:
lpattern(dash)
works to change its pattern but it does not work with
Code:
in range()
.

Thank you.