Wednesday, March 15, 2006

RE: st: RE: pie charts

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 > 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 > > > > * > * For searches and help try: > * > * > * >

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