Adding a horizontal line to an hbar – It's possible in Graph Editor; how to do it programmatically?

[Nils Enevoldsen]

I run this:

sysuse auto, clear
graph hbar price, over(foreign)

Using Graph Editor, I can add a reference line like this:

I want to add that line using my do-file. I tried this:

graph hbar price, over(foreign) yline(50)

That resulted in this:

So I tried

graph hbar price, over(foreign) xline(50)

which gave the error

xlines(50) not allowed, xaxis1 does not exist

How do I add a horizontal line in my do-file, instead of using Graph Editor?

[Marcos Almeida]

Unfortunately, I fail to see the point of doing so, unless for other reasons apart from the core function of a hbar graph itself.

This is what we get from the Stata Manual:

yline() adds horizontal (bar) or vertical (hbar) lines at specified y values; see [G-3] added line options. The xline() option, also documented there, is irrelevant for bar charts.

[eric_a_booth]

You could use -twoway- to get this. Example:

sysuse auto, clear

collapse (mean) price, by(for)

twoway (bar price for, sort barwidth(.5) horiz),  yline(.5, lwidth(vthick)  lpattern(tight_dot)) ylabel(0(1)1, valuelabel)

[Friedrich Huebler]

How do I add a horizontal line in my do-file, instead of using Graph Editor?

Any change in the Graph Editor can be incorporated in a do-file. See this post for more information: https://www.statalist.org/forums/for...r-graph-panels

[Nils Enevoldsen]

Thanks, all! Friedrich, that's excellent general-purpose advice. I will remember this.