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Re: st: Re: pie charts


From   Christopher.Grigoriou@unil.ch
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: pie charts
Date   Thu, 16 Mar 2006 21:37:57 +0100

I will try it
thank you very much
Christopher

Christopher,

What do you think of a stacked bar chart?

year   Germany     Japan       USA
2000         9         6         8
2001        10         7         9
2002        11         8        10

graph bar (asis) Germany Japan USA, over(year) stack

Friedrich Huebler

--- Christopher.Grigoriou@unil.ch wrote:
> ...I also agree with Nick and you that a legend with 229 values is
> likely to be unreadable...I have cleaned my data...hence, now, with
> one importing country, 13 years, and the ten first partners for
> each year, "it worked", if and only if instead of defining my graph
> over(partner) I defined it over(rank) that is to say over the rank
> of each partner: 1, 2, ..., 10. With the rank at each year having
> of course the same code (while the ten countries are different at
> each year and hence have different codes),
> "stata did accept" to represent the ten pies but without taking
> into account the evolution of the total amount of imports. Anyway
> it was just to present a kind of brief overview of my dataset...
> 
> Many thanks for your answers
> Regards
> Christopher
> 
> 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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