[Andrew Musau]

Perhaps use the graph editor with graph.

* Example generated by -dataex-. To install: ssc install dataex
clear
input byte seminar_series_mod_num int video_name_num byte first_obs
0 2 1
0 2 0
0 2 0
0 3 1
0 3 0
0 3 0
0 3 0
0 3 0
0 3 0
0 3 0
0 3 0
0 4 1
0 4 0
0 4 0
0 4 0
0 4 0
1 1 1
1 1 0
1 1 0
1 1 0
1 1 0
1 2 1
1 2 0
1 2 0
2 3 0
2 4 1
2 4 0
2 5 0
2 80
3 1 0
3 2 1
3 3 0
3 4 0
3 5 0
4 1 1
4 1 0
4 2 0
end

set scheme s1mono
contract seminar_series_mod_num video_name_num
contract seminar_series_mod_num, freq(count)
sort count seminar_series
gen long overid=_n

quietly sum count
local max= r(max)

gr bar count, over(overid, label(nolab))  text(-0.12 25  "25%") text(-0.12 50  "50%") ///
text(-0.12 75  "75%")  plotregion(margin(zero))  ytitle("")
foreach num of numlist 25 50 75{
     gr_edit .plotregion1.AddLine added_lines editor `num' `max' `num' 0
}

[Jean Jacques]

It's what I wanted! Thanks a lot