How to include an oblique line on a graph ?

[Antoine Malezieux]

Hello everybody,
It is my first post here, sorry if I am not totally respecting customs (I don't know for example if my question is not too simple).
My trouble is about drawing a line. My graph represents the income and declared income of a set of individuals. I want an oblique line representing the frontier of 100% income declaration.

I have the following graph:

I obtained it in the following way: tw (scatter amountdeclared income if serment==0, mcolor(blue)), ytitle(Revenu déclaré) xtitle(Revenu)

I would like to draw an oblique line from the lowest corner on the left to the higher corner of the right, with all the points declaring 100% on it.

Do you think there would be a way to do it with stata ?

Thank you very much in advance.

Best regards,
Antoine

[Clyde Schechter]

Try this:

tw (scatter amountdeclared income if serment==0, mcolor(blue)) (line income income), ytitle(Revenu déclaré) xtitle(Revenu)

You may want to add some options to control line style and color, but that give you a line to work with.

[Nick Cox]

Clyde is right, naturally, but I've found that

(line income income, sort)

does no harm.

[Antoine Malezieux]

Try this:

tw (scatter amountdeclared income if serment==0, mcolor(blue)) (line income income), ytitle(Revenu déclaré) xtitle(Revenu)

You may want to add some options to control line style and color, but that give you a line to work with.

Clyde is right, naturally, but I've found that

(line income income, sort)

does no harm.

Thank you very much !