Creating reference lines, which are annotated in the legend - what's wrong with my code

[Denise Vella]

I'm using the following code and obtaing the following graph
The only issue is that I am not seeing the reference lines plotted - I would like to plot reference line (green x 0.59 y 1.5) ; reference line blue (x 0.74 y 1.5)


Why is that?

qnorm ratios, rlopts(lc(black) lw(medthick)) ms(none) mc(black) connect(1) lp(dash) lc(black) ///
addplot(scatteri 1.5 0.59, recast(line) lc(green) ///
|| scatteri 1.5 0.74, recast(line) lc(blue) ) ///
legend(order(3 "5th centile" 4 "INew Ratio") pos(5) row(1))

[George Ford]

why not use xline, yline ?

[Denise Vella]

yes I've used x line and Y line but the problem is I would like the annotations of these lines to appear in the legend (5th centile, INew Ratio) rather than adjacent to the lines (this looks too busy on the graph)

The only solutions were to use scatteri - unless of course there are other solutions you can think of

[George Ford]

you can write an function as a graph. here, a constant.

sysuse auto, clear
qnorm mpg , addplot(function 20 , range(0 40))

[Denise Vella]

thanks, this creates a y line
I would like to create 2 line at 2 different x values

sysuse auto, clear 
qnorm mpg, addplot(function 20, range (0 40) horizontal) // 
|| function 10  //this produces another text value for this function in the legend - when I proceed to try plot it **see below


//attempt 2 
sysuse auto, clear 
qnorm mpg, addplot(function 20, range (0 40) horizontal) // 
|| function 10 , range (10 40) horizontal 


//this produces an error | is not a valid command name

And how do I rename the function line appearing in the legend as 'reference'

[George Ford]

scatteri need (y,x) start and (y,x) end.

qnorm mpg  ,  addplot(scatteri 0 20 40 20  , recast(line) || scatteri 20 0 20 40, recast(line) )