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RE: st: RE: pie charts


From   "David Harrison" <david.harrison@icnarc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: pie charts
Date   Wed, 15 Mar 2006 17:13:52 -0000

If you have 10 main partners in each of 10 years, then this could not
possibly produce the 229 levels of the -partenaires- variable that Stata
has found - it would give you at most 100, and, if some of the main
partners exist across multiple years fewer than this. You need to drop
(or at least exclude) all records except the 10 main partners in each
year. This would reduce your problem, but, unless it leaves 15 or fewer
main partners across the 10 years, will not fix it.

Another option is to define additional styles for p16pie, p17pie etc in
your own scheme file (see -help scheme files-). For example, saving the
text below as scheme-pietest.scheme in your ado path, and adding the
option -scheme(pietest)- to your -graph- command will add definitions
for a 16th slice of pie coloured bright red...

#include s2color
areastyle p16pie p1
color p1 red

However, I would also agree with Nick that (1) a legend with 229 (or
even 100) values is going to swamp your graph; and (2) pie charts aren't
very easy to read anyway!

David

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
Christopher.Grigoriou@unil.ch
Sent: 15 March 2006 15:38
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: pie charts

In a first stage I had dropped all the partners but the ten main
partners for each year that is why there is nothing in the syntax to
identify these partners. 
I wonder if the problem is not that the ten first partners are not the
same for each year? And even though the ten first main partners are not
the same why stata cannot, for each year, apply the command? Isn't there
something to do with the long or wide format of the data?

By the way, a time series graph could be used to show the evolution of
one particuliar partner but not of the structure contrary to a serie of
pie charts which could, I think, both represent the distribution of the
pie and the evolution in the size of the pie...

Anyway thank you for your answer,
regards
Christopher

I have three ideas here. 

1. The variable -partenaires- evidently
has 229 categories, and Stata will be struggling to cope. 

Quite possibly all you will see is a legend and the charts themselves
will be out of sight. 

2. I can't see how your syntax corresponds to identifying the ten main
partners. 

3. Although you want a series of pie charts it is difficult for me to
see how they will convey the structure of your data at all well. A time
series graph appears more natural here. Stata does supply pie charts --
largely so nobody can say "But you can't get a pie chart in Stata!" --
but that doesn't make them an effective method for showing comparative
structure over time. 

Nick
n.j.cox@durham.ac.uk 


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