binscatter and multiple linetypes possible

[Rebecca Ivester]

Hi all--I am wondering if there is a way to plot both a linear and quadratic line on my scatters. When I try one or the other, it works fine, but it doesn't seem to work with both. Maybe my syntax is wrong or maybe there is a more creative way to do this . . . does anyone have advice? (Also, I realize I can make this work with scatter, but I have too many points, so I've been using binscatter.)

WORKS:

 binscatter resid prop_same, nquantiles(100) line(qfit)

DOESN'T WORK:

 binscatter resid prop_same, nquantiles(100) line(lfit) line(qfit)

DOESN'T WORK:

 binscatter resid prop_same, nquantiles(100) line(lfit qfit)

[Nick Cox]

binscatter is from SSC, as you are asked to explain (FAQ Advice #12)As I understand it, you need to choose one linetype.

[Scott Merryman]

use the -savedata()- option, then import the data, and call:

scatter resid prop_same  || lfit resid prop_same || qfit resid prop_same

[Nick Cox]

I don't understand the advantage here of binscatter over just calling up lfit and/or qfit directly. So far as I can see binscatter bins the data and allows data-driven summaries -- which is more than fine by me, and I did something loosely similar way back in binsm (STB/SJ) -- but linear and quadratic fits that ignore within-bin variation are not so appealing.