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Re: st: RE: RE: Putting a rug underneath a boxplot
From
Oliver Jones <[email protected]>
To
[email protected]
Subject
Re: st: RE: RE: Putting a rug underneath a boxplot
Date
Wed, 23 Mar 2011 18:41:41 +0100
Hi,
I totally agree that in the case when there is just one rug, all one needs
is the axistitle.
But if the task is to plot one boxplot (using all date) and then putting
separate rugs for different groups underneath the boxplot, then it is
necessary to create a legend explaining which rug represents which group.
Because I needed to create 12 different such "box and multi-rug plots",
the magic "5" had to be set manually for each plot (the scales of the 12
variables where quite different).
To avoid setting it manually (i.e. defining the width of the bars/pipes)
I did something like this:
summary price, meanonly
gen price1 = price - ( (r(max) - r(min)) / 2000 )
gen price2 = price + ( (r(max) - r(min)) / 2000 )
Maybe this is helpful for someone...
Best
Oliver
Am 23.03.2011 17:54, schrieb Nick Cox:
Thanks for this. Good point about -symxsize()-. I seem to recall some
reason why this didn't seem to be the solution in an earlier thread,
but I think you are right: if you want these pseudo-pipes in a legend,
then it helps. A bigger point is why do you want a legend at all, as
much of the point of a strip plot is that the axis labels carry that
information.
For those interested in thin rbars as mimicking pipe symbols, here is
a simpler example. I will add something like this to the help for
-stripplot-. The "5" is empirical as producing a thin bar on the scale
of the variable -price-.
sysuse auto, clear
gen price1 = price - 5
gen price2 = price + 5
stripplot price, over(rep78) box ms(none) ///
addplot(rbar price1 price2 rep78, horizontal barw(0.2) bcolor(gs6))
There are small artefacts when the edge of a box coincides with a pipe symbol.
Your other troubles seem to arise from using -grc1leg- and/or -graph
combine-, but in any case I don't understand what they are.
Nick
On Wed, Mar 23, 2011 at 3:39 PM, Oliver Jones
<[email protected]> wrote:
Hi Nick,
thanks al lot for your help. Everything works fine now.
I just ran into some more trouble while combining 12 of these stripplots
using -grc1leg- from http://www.stata.com/users/vwiggins. There is no error
message when one specifys the xsize() option to control overall aspect
ratio.
A very easy work-around is to use -graph display- after generating the
combined
graph, see http://www.stata.com/statalist/archive/2008-12/msg00086.html.
Also combining graphs in Stata is quiet tricky because the iscale() option
seams to trade between textsize and markersize, is that correct?
By the way to change the length of legend entry one can avoid the graph
editor
and use the option symxsize() within the legend() option.
Am 23.03.2011 12:16, schrieb Nick Cox:
First, please remember to specify where user-commands you refer to
come from. In this case -stripplot- is from SSC. (Otherwise anyone who
does not know that could try repeating your example and would get
puzzling error messages.)
This question in essence repeats one raised by Jannik Helweg-Larsen in
the thread starting with
http://www.stata.com/statalist/archive/2011-03/msg00240.html
The problem is that with -ms(none)- the corresponding legend entry is
blank.
The work-around in Jannik's thread was to use a thin -rbar-. The
legend entry is much longer than you want, but you can fix it in the
Graph Editor.
Here is example code for your example problem:
sysuse auto, clear
* Create ancillary variables
gen y = 1
gen y_foreign = y
label variable y_foreign "Foreign"
gen y_not = y - 0.05
label variable y_not "Not Foreign"
gen y_miss = y - 0.1
label variable y_miss "NA"
gen byte index_region = 1 if foreign == 1
replace index_region = 2 if index_region == .
replace index_region = 3 if foreign == .
label define lbl_index_region 1 "Foreign" 2 "Not Foreign" 3
"Missing"
label values index_region lbl_index_region
gen price2 = price + 10
*
local boxoffset = 0.1
stripplot price, over(y) ///
title("My Box- and Rug-Plot") ///
legend(order(6 7 8) cols(1) on) ///
box(barwidth(0.1)) iqr boffset(`boxoffset') ///
ms(none) ///
addplot(rbar price price2 y_foreign if index_region == 1, ///
horizontal barw(0.02) bcolor(blue) || ///
rbar price price2 y_not if index_region == 2, ///
horizontal barw(0.02) bcolor(red) || ///
scatter y_miss price if index_region == 3, ///
ms(X) mcolor(black) ///
) ///
yscale(off) ylab(1(0.1)1.15, nogrid)
On Wed, Mar 23, 2011 at 10:56 AM, Oliver Jones
<[email protected]> wrote:
the topic is some month old, but today I had a look at the box and rug
plots
I created
using the stripplot command.
To create the rug, I followed the advice and generated a string variable
containing the
symbol "|".
Here is an example of what I do:
************************* begin example *************************
graph drop _all
sysuse auto, clear
* Create ancillary variables
gen y = 1
gen y_foreign = y
label variable y_foreign "Foreign"
gen y_not = y - 0.05
label variable y_not "Not Foreign"
gen y_miss = y - 0.1
label variable y_miss "NA"
gen byte index_region = 1 if foreign == 1
replace index_region = 2 if index_region == .
replace index_region = 3 if foreign == .
label define lbl_index_region 1 "Foreign" 2 "Not Foreign" 3
"Missing"
label values index_region lbl_index_region
gen pipe = "|"
*
local boxoffset = 0.1
stripplot price, over(y) ///
title("My Box- and Rug-Plot") ///
legend(order(6 7 8) cols(1) on) ///
box(barwidth(0.1)) iqr boffset(`boxoffset') ///
ms(none) ///
addplot(scatter y_foreign price if index_region == 1, ///
ms(none) mla(pipe) mlabcolor(blue) mlabpos(0) ||
///
scatter y_not price if index_region == 2, ///
ms(none) mla(pipe) mlabcolor(red) mlabpos(0) ||
///
scatter y_miss price if index_region == 3, ///
ms(X) mcolor(black) ///
) ///
yscale(off) ylab(1(0.1)1.15, nogrid)
************************* end example *************************
The problem is the legend, I need the red and blue pipe symbol as legend
key-symbols.
Is there a way I can tell Stata to use such symbols?
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