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RE: st: RE: pie charts


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: pie charts
Date   Wed, 15 Mar 2006 15:52:58 -0000

I can't say anything about your data that 
you're not telling me. But if you have 229
different partners in total, then Stata needs 229 
ways of representing them, which is what 
-graph pie- is telling you. The structure 
of your data is not really the issue: 
it is how many slices need to be explained 
in a graph legend. 

What you can do is draw 10 separate graphs, 
one for each year, and then use -graph 
combine- to put them together. But then 
the legends will differ and all hope of 
comparability disappears. 

Having two or more time series does not 
rule out a time series graph. Check out 
-tsline- or -xtline-. 

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

Christopher.Grigoriou@unil.ch
 
> 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,
 
> 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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