Stata: Combine graphs sharing one common y-axis

[Ben Jaay]

Hello,

I want to combine 2 or more graphs/plots [scatter plots, box plots, OLS regression lines, etc.] that show one common y-axis instead of replicating the y-axis for each graph.

eg. I tried:

graph box var1, saving(boxplot1.gph)
graph box var1, over(group) saving(boxplot2.gph)
gr combine boxplot1.gph boxplot2.gph

It did combine the 2 boxplots but with 2 y-axes with exactly the same scales. How to show just one y-axis for both plots?

I searched the Stata commands and the web but can't find what I want.

Are there commands or coding convention to combine graphs and display just one common y-axis - not just for box plots but other types of graphs as well?

Thanks in advance.

Regards,

Benjamin

[Nick Cox]

In your case, there is an easy alternative. You want to show the box plots for each group, together with the box plot for everything combined.

This is easy

 
sysuse auto, clear
graph box mpg, by(foreign, total row(1))

Consider also this example:

sysuse auto, clear
preserve
local Np1 = _N + 1
expand 2
replace foreign = 2 in `Np1'/L
label def origin 2 "All", add  
graph box mpg, over(foreign)
restore

Also http://www.stata-journal.com/article...article=gr0058

[Ben Jaay]

Hi Dr. Cox,

It works! You are right, it's so easy.

I will get a copy of your article as well.

Thanks so much!

Regards,

Ben