Overlay qqplot combine graphs

[Minnie Smith]

Hello,

I have four variables which I would like to generate quantile plots for. These are q_base q_final1 q_final2 and qfinal3.

q_base is to be depicted on the x-axis and the other three on the y-axis. Therefore, my qqplots are:

qqplot q_final1 q_base
qqplot q_final2 q_base
qqplot q_final3 q_base

I'd like to overlay the graphs and basically generate one qqplot which maps q_final1 q_final2 and q_final3 against 1_base on the same graph.

Any help is much appreciated!

[Scott Merryman]

Ariel Linden's qqplot3 (ssc desc qqplot3) allows one to save the generated quantiles.

[Nick Cox]

cquantile (SSC) will also help here.

clear 
set obs 100 
set seed 2803 

foreach v in q_final1 q_final2 q_final3 q_base { 
    gen `v' = rnormal()
} 

forval j = 1/3 { 
    cquantile q_base q_final`j', gen(b`j' f`j') 
} 

scatter f* b1, legend(order(1 "final 1" 2 "final 2" 3 "final3") pos(11) ring(0) col(1)) ///
xtitle(base) aspect(1) ytitle(final) ms(Oh X Sh)