twoway: How to center x-axis title with by() option

[Philippe Joly]

When I create this twoway graph using the by() option, the x-axis title is not centered on the inner plot region (it is centered relative to the whole figure). This does not look good, especially with long value labels on the y-axis. Is there anyway to center the x-title properly?

sysuse auto, clear
twoway (scatter price weight), ylabel(, angle(horizontal)) by(foreign)

[Andrew Musau]

You could manually add the gap if it bothers you that much.

sysuse auto, clear
twoway (scatter price weight), ylabel(, angle(horizontal)) ///
by(foreign) xtitle("                 `:var lab weight'")

[Nick Cox]

Cross-posted at https://stackoverflow.com/questions/...with-by-option

(I agree: although it's utterly ad hoc, I tend just to add spaces to shunt a title left or right.)

[Philippe Joly]

Thanks a lot for your answer! If at some point a less ad hoc solution comes up, I would be very interested.