How to change a line pattern within a same graph?

[Priver JM]

Hi,
I would like to plot a graph using

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

lpattern(dash)

works to change its pattern but it does not work with

in range()

.

Thank you.

[Andrew Musau]

You can use the -if- qualifier for part of the line, but with a small number of data points, the problem becomes one of interpolation. See, for example, https://www.statalist.org/forums/for...ts-of-the-line

[Priver JM]

I appreciate your comment. That works well!