Overlay non-twoway graphs

[Anna Polsi]

Hi Statalisters,

I would like to overlay two non-twoway type graphs - e.g., graph dot and graph hbar - but it seems that Stata does not support this feature. For example, I would like to produce a graph which overlays the following

sysuse auto, clear

*first graph to overlay
gr hbar weight, over(foreign) 

*second graph to overlay
gr dot price, over(foreign)

*This line will not work
gr hbar weight, over(foreign) || gr dot price, over(foreign)

Do you have any advice on how I should proceed?

Thank you!

[Nick Cox]

I don't see any point in overlaying weight and price which don't even have he same units of measurement. Butpresumably your real example is different. twoway will let you overlay graphs.

Consider a display such as given here: https://www.statalist.org/forums/for...ailable-on-ssc

[Anna Polsi]

Thank you, Nick, for your answer. My example made little sense, indeed. In my real example, the unit of measurement is in fact the same.

I will definitely consider the command multidot for future graphs but it does not really produce the type of graph I have in mind. Precisely, I would like to replicate the graph below. Also, correct me if I am wrong, I cannot use twoway graphs because I have to plot a continuous variable over categories.

Thank you!

[Nick Cox]

You can draw something like that with twoway. Post some sample data to get realistic code suggestions.

[Anna Polsi]

Below a sample data

iso3	flfpp0819	flfp08	flfp19
AUS	59.24	58.71	60.3
GBR	56.39	55.30	57.65
ITA	39.43	38.44	40.76
MEX	43.71	42.73	44.19
USA	56.74	58.46	56.13

I tried with twoway as follows

two (bar flfp0819 iso3) (dot flf08 iso3) (dot flfp19 iso3)

where iso3 is encoded. However, the outcome does not look like graph bar or graph dot because of the encoded variable on the x axis.

[Nick Cox]

These values are so close that the design works poorly. After some play I came up with this.

clear 
input str3 iso3    flfpp0819    flfp08    flfp19
AUS    59.24    58.71    60.3
GBR    56.39    55.30    57.65
ITA    39.43    38.44    40.76
MEX    43.71    42.73    44.19
USA    56.74    58.46    56.13
end 

graph dot (asis) flfp08 flfpp0819 flfp19, over(iso3, sort(1)) exclude0 ///
marker(1, msize(medlarge) ms(X)) marker(2, ms(Oh)) marker(3, ms(+))    ///
legend(row(1)) ysc(alt r(35 .)) linetype(line) lines(lw(thin) lc(gs12))

I have no idea what these variables are (https://acronyms.thefreedictionary.com/FLF) but you've enough room for variable labels (and better country names).

[Romalpa Akzo]

Below code could give a hint. Adjustments would be needed with your own style..

egen c = group(iso3), label

tw (bar *819 c, barw(0.4)) (sc *8 c, m(o) msiz(huge)) (sc *p19 c, m(x) msiz(huge)), xlab(, val)

[Anna Polsi]

Thank you both for your advice!