stripplot in the same graph (same axes for both distributions)

[Tabare Capitan]

I have a variable VALUE with two distinct groups noted by GROUP (dummy), I would like to write:

stripplot VALUE, over(GROUP)  cumul cumprob bar refline

to get the plot with the distributions, the confidence intervals, mean, and reference lines of each GROUP in the same graph (that's within the same axes).


However, the behavior of the option "over" here seems to be the similar as the option "by", as opposed to, for example, in qplot. The option "separate" gets closer by plotting both distributions, but shows a joint reference line, confidence intervals, and mean.

Is there any way to do what I want?

Thank you.

[Nick Cox]

stripplot is a community-contributed command from SSC, as you are asked to explain (FAQ Advice #12). You don't provide example data (see same place) or show any graphs you got (ditto).

It is not correct, however, that over() and by() work the same way and I am at a loss to know why you make that claim. The difference lies in presenting within one panel and within two panels. Here are two simple examples:

sysuse auto, clear 

stripplot mpg, over(foreign) vertical cumul cumprob bar refline height(0.5) xla(, noticks) yla(, ang(h)) 

stripplot mpg, by(foreign) vertical cumul cumprob bar refline height(0.5) xla(, noticks) yla(, ang(h))

[Tabare Capitan]

Thanks for the reply Nick. I will clarify.

I meant that the option by and the option over are similar in that they both plot the distributions using a different x-axis. For example, using this dataset:

* Example generated by -dataex-. To install: ssc install dataex
clear
input float valinfoim byte endow
-.005 1
 1.75 0
 1.75 1
-.005 0
 .005 1
 1.75 0
 .875 1
 .005 0
 .005 1
 .875 0
 -.13 0
 1.75 1
 .875 1
-.875 0
 .625 0
 .005 0
 .875 1
-1.25 1
 .005 1
    4 0
end

When I use the option over, I get:

#delimit ;

stripplot valinfoim,                                                            
                over(endow)                                                 
                cumul cumprob                                       
                bar(lcolor(black) lcolor(black))  
                refline(lpattern(dash))                  
                title("TITLE")                                                    
                legend(off)                                             
                vertical                                                             
                height(0.8)                                                       
                boffset(0)                                                             
                yla(, ang(h))                                                     
                xtitle("")                                                            
                xla(,                                                                 
                ang(-.001) labgap(2) noticks)    
;

If I use the option by, I get:

#delimit ;

stripplot valinfoim,                                                           
                by(endow)                                                       
                cumul cumprob                                              
                bar(lcolor(black) lcolor(black))                        
                refline(lpattern(dash))                                     
                title("TITLE")                                                   
                legend(off)                                                      
                vertical                                                           
                height(0.8)                                                      
                boffset(0)                                                            
                yla(, ang(h))                                                     
                xtitle("")                                                            
                xla(,                                                                  
                ang(-.001) labgap(2) noticks)          
;

But I would like something closer to what I get when using the option separate:

#delimit ;

stripplot valinfoim,                                                             
                separate(endow)                                              
                cumul cumprob                                                 
                bar(lcolor(black) lcolor(black))                          
                refline(lpattern(dash))                                       
                title("TITLE")                                                    
                legend(off)                                                        
                vertical                                                              
                height(0.8)                                                        
                boffset(0)                                                              
                yla(, ang(h))                                                      
                xtitle("")                                                             
                xla(,                                                                   
                ang(-.001) labgap(2) noticks)     

;

However, in the graph above, I get one bar and one reference line for the combined data, instead of one bar for each category. I understand that this is the intended behavior of the program, but I was just wondering if there is any easy way get one bar for each category and to plot the two distributions together.

Thanks again.

[Nick Cox]

Sorry, but that's not supported and not part of any development intentions.