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st: Controlling alignment of left AND right axes in combined graphs


From   "Marcelo Villafani" <villafani.1@osu.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Controlling alignment of left AND right axes in combined graphs
Date   Sun, 18 Mar 2007 10:07:33 -0400

I am plotting two separate graphs that have horizontal ylabels on the right
and left axes, that later are combined in a col(1) orientation with the
second plot providing xlabels for both of them. The problem is that the
y-axes have different numbers of digits and I cannot align the ylabels.

I found that a similar question was posted last January regarding the left
axis, but I couldn’t adjust the suggested solution to the case where left
and right y-axes are used simultaneously.

Any help would be greatly appreciated.


Marcelo

----------------
ADDENDUM

Adjusting David Elliot’s “ascii art” to my question, graphically my problem
is how to combine:

+---Graph 1---------------------+
|                               |
|   5000+-----------------+500  |
|       |                 |     |
|       |                 |     |
|       |                 |     |
|       |                 |     |
|   2500|  Plot 1         |250  |
|       |                 |     |
|       |                 |     |
|       |                 |     |
|    500|                 |50   |
|      0+-----------------+0    |
|               Year            |
+-------------------------------+

+---Graph 2------------------------+
|                                  |
|   100000+-----------------+1000  |
|         |                 |      |
|         | Plot 2          |      |
|    10000|                 |      |
|         |                 |      |
|         |                 |      |
|     1000|                 |100   |
|        0+-----------------+0     |
|               Year               |
+----------------------------------+

To something that looks like this:

+---Combined-----------------------+
|                                  |
|    5000+------------------+ 500  |
|        |                  |      |
|        |                  |      |
|        |                  |      |
|        |                  |      |
|    2500|  Plot 1          | 250  |
|        |                  |      |
|        |                  |      |
|        |                  |      |
|     500|                  |  50  |
|       0+------------------+   0  |
|                                  |
|  100000+------------------+1000  |
|        |                  |      |
|   10000| Plot 2           |      |
|        |                  |      |
|    1000|                  | 100  |
|       0+------------------+   0  |
|                Year              |
+----------------------------------+

On the other hand, Scott Merryman (2/5/2007) provided this neat solution to
David’s left axis alignment problem:

clear
set obs 100
gen x = uniform()
gen y1 = uniform()*10
gen y2 = uniform()*100
gen y3 = uniform()*400
gen y4 = uniform()*90000

foreach i of numlist 1 3 {
qui sum y`i'
_natscale `=r(min)' `=r(max)' 5
local m`i' = r(max)
local l`i' = length("`m`i''") 

local j = `i' + 1
qui sum y`j'
_natscale `=r(min)' `=r(max)' 5
local m`j' = r(max)
local l`j' = length("`m`j''")
local diff = (`l`j''- `l`i'')*2 

display "lengths: " "`l`i'' `l`j'' `diff'"

scatter y`i' x, ylabel(,angle(h)) xlabel(none) xtitle("") ///  ytitle(,
margin(0 `diff'  0 0 )) name(gr1, replace) scatter y`j' x, ylabel(,angle(h))
name(gr2,replace) ///  ytitle(, margin(0 0 0 0 )) graph combine gr1 gr2,
col(1) name(gr_`j', replace) graph drop gr1 gr2 }

Thanks for your help once again.


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