How to shade the area in a graph

[Tiago Pereira]

Dear all,

I have been dealing with a graph, which can be represented as follows:

twoway (function y=abs(invnorm(1-1*normal(2/sqrt(x)))), range(0 1) lcolor(black) ) (function y=0+invnorm(1-1*normal(2/sqrt(x))), lcolor(black)  range(0 1)  yline(-2(0.01)2, lcolor(gray*0.20)))

Is there a way to shade the entire area (between the two lines)? As you can see, what I have got so far is the horizontal shading between -2 to 2, which is very straightforward. However, I would need the shading from -8 to 8 (vertical axis) - provided that the shading is between the two black lines.

Any thoughts?

All the best,

Tiago

[Nick Cox]

See https://www.stata-journal.com/articl...article=gr0067 for discussion of related technique.

[Rafal Raciborski (StataCorp)]

Something like this may work:

clear
set obs 301
gen x = (_n-1)/_N
gen y1 = abs(invnorm(1-1*normal(2/sqrt(x))))
gen y2 = invnorm(1-1*normal(2/sqrt(x)))
twoway rarea y1 y2 x

[Tiago Pereira]

As usual, thank you so much Nick and Rafal for your extremely helpful tips and suggestions.

All the best,

Tiago