Stacking strip plots together

[Leonardo Guizzetti]

I'm uncertain how produce a graph, and I would appreciate a nudge in the right direction with a minimal example. I'd like to graph, in a single dot plot/strip plot, the mean of one common variable (plotted along the x-axis), by the levels from a number of categorical variables. The below graph is visually similar to what I would like to create.

[Andrew Musau]

I think you will need to stack all the groups into one variable. Something like

sysuse auto, clear
keep make rep78
forval i=1/3{
    gen rep`=78+`i''= rep78
}
reshape long rep, i(make) j(which)
gen group= group(rep)
gr dot rep, over(group) over(which) scheme(s1color) ytitle("")

Res.:

[Nick Cox]

Andrew Musau give a very nice solution, but the line

gen group = group(rep)

by accident or design uses a Stata function group() that is long since not documented.

egen group= group(rep), label

is what I would advise. See also e.g. https://www.stata.com/statalist/arch.../msg00406.html for links to previous discussions.

BTW, I would call this a dot plot or dot chart. The term Cleveland dot chart or plot is sometimes used to signal that Bill Cleveland pushed the idea mightily from 1984 on -- although antecedents can be found -- and to flag that we are not talking about dot plots (histograms done as dot displays).

[Andrew Musau]

That was definitely accidental Nick Cox , I meant egen. Although I am aware of the existence of the undocumented group() function of generate, I find your link very useful in understanding what it actually does.

[Leonardo Guizzetti]

Thank you Andrew Musau , stacking the data was the trick I was missing. Thanks also to Nick Cox for the suggestion for egen's -group()- function.