One way to proceed is splendidly ad hoc.
use http://www.stata-press.com/data/r10/friedman2.dta
gen year = yofd(dofq(time))
collapse m1 consump , by(year)
gen year1 = year - 0.2
gen year2 = year + 0.2
twoway bar consump year1, barw(0.4) || bar m1 year2, barw(0.4)
(In this example, no doubt there is a case for a different kind of -collapse-, but it doesn't affect the graphical issue.)
Such age-old trickery was written up in
SJ-7-1 gr0026 . . . . Stata tip 42: The overlay problem: Offset for clarity
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J. Cui
Q1/07 SJ 7(1):141--142 (no commands)
tip for graphing several quantities on a continuous axis
Nick
[email protected]
Jochen Späth
After screening the statalist and some graphical advice literature in the last days I still haven't got the clue:
I need to draw a bar graph for two time series with different scales (e.g. one in millions, the other in billions) over years.
Graph bar delivers the desired over-all look as, f.i., in
-graph bar var1 var2, over(year)-.
But I would like to have two different scales (left and right).
-graph bar- does not offer such an option with the -over-option - logically.
In -twoway bar-, which has the option for a second vertical axis as in
-graph twoway (bar var1 year, yscale(1)) (bar var2 year, yscale(2))-,
I have not managed to override the default result that the bars are drawn one behind the other - I rather want them one beside the other (and grouped over years).
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
