前面有水平参考线的条形图

Question

我正在尝试创建一个条形图，我需要为特定的y值设置参考线。我可以用yline做到这一点：

graph bar libdem, over(country, sort(libdem) descending label(alternate)) ///
bar(1, color(gs10) lcolor(black) lwidth(medium)) ytitle("") yline(.3864677, lstyle(foreground)) ///
title("Liberal Democracy") ylabel(,gstyle(minor)) legend(off)

导致：

问题是参考线在后台并且不够可见。将它放在前景中，覆盖在条形图上会很不错。我试过了lstyle，但它没有做到这一点。我看到this post类似的内容，但问题是我无法弄清楚如何使||与over一起工作

Answer 1

Here's the code from the Statalist post you linked to

sysuse auto, clear

collapse mpg, by(rep78)

twoway bar mpg rep78, base(0) barw(0.6) || function y = 23, ra(0.7 5.3) ///
yla(0(5)40) legend(off) ytitle(Mean miles per gallon) xtitle(`: var label rep78')

and here's the proof that it works:

You don't provide a reproducible example and don't indicate explicitly what code you tried to add a horizontal line. But possible problems are evident:

1. The device above won't work with graph bar. You do need to use twoway bar instead.

2. Before you do that you will need to collapse libdem, by(country) to get a dataset with means.

-- which are why the example was phrased as it was.