How to visually depict how age affects the association between an independent variable on a dependent variable over certain percentiles

[Niko Vahasarja]

Hi!

I'm looking for a way to visually depict how age affects the association between an independent variable on a dependent variable over certain percentiles
So far I have used sqreg with bootstrapped standard errors stratified by age group and entered the output for _cons and the interaction coefficient for the 75th, 85th and 95th percentile in Excel and as you can see, the association decreases with age (please see the attached picture).
However, I now want to plot this decreasing interaction over age as a continuous variable instead of stratified by age group.

I have tried

sqreg cacs_tot parod1 c.ageatvisitone , quantile(.75 .85 .95) reps(100)
qregplot c.ageatvisitone,

But this does not give me what I want (please see attached image).

* Example generated by -dataex-. To install: ssc install dataex
clear
input int cacs_tot float(parod1 ageatvisitone)
0 0 63.6
1 0   57
0 0 62.2
0 0 53.3
0 0 50.7
0 0 53.5
0 0 53.4
. 1   55
0 1 55.4
7 0 50.5
end

Regards,
Niko