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Re: st: RE: Venn diagrams


From   David Elliott <dcelliott@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Venn diagrams
Date   Fri, 22 Oct 2010 22:18:40 -0300

Philip

If faced with the situation of having to use a bitmap from such a tool
in the future, may I suggest pasting the image into the background of
a vector drawing application (MS Powerpoint would do, actually).  Then
use the bitmap as a guide to draw circles of the right proportions and
placing within the universe.  Once this is done, the entire vector
diagram can be coloured and resized to your liking with any titles,
legends, etc., and the background bitmap deleted.

Incidentally, I was unable to connect to the link to the online tool you posted

On 22 October 2010 21:02, Philip Burgess <philip.burgess.uq@gmail.com> wrote:
> On Sat, Oct 23, 2010 at 8:20 AM, Philip Burgess
> <philip.burgess.uq@gmail.com> wrote:
>>
>> Nick & David;
>>
>> Thanks for your thoughtful comments, suggestions and links.
>>
>> I thought I had updated venndiag on  -ssc- but not so. My mistake. I have done now and it works fine.
>>
>> I agree entirely with Nick that Venn diagrams are of limited value for data analysis; but David's observation about unsophisticated audiences was exactly my objective.
>>
>> My target audiences are policy & planning folk who are less enthusiastic about the trigonometry and just want a very simple explanation of all matters we find challenging and complex. Proportional Venn diagrams generally achieve that end.
>>
>> For others interested, I earlier came across this software:
>>
>> http://omics.pnl.gov/software/VennDiagramPlotter.php .
>>
>> It's free, it's simple, produces a *.bmp output but doesn't (seem to) have any means of enhancing the chart - adding legends, etc. I have manually edited in Paint but it's less than ideal. These features are great in -venndiag- but, understandably, lacks the proportionality.
>>
>> Anyway, again I appreciate the feedback and advice.
>>
>> Philip
>>
>>
>> On Fri, Oct 22, 2010 at 11:31 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
>> > Not so; -venndiag- from SSC is more recent and it supersedes anything in the STB.
>> >
>> > But why be surprised?
>> >
>> > 1. Writing a Venn diagram program that always looks good and works well is a tricky problem. Wanting the areas exactly right is an easy desideratum to state, but it does not make the problem easier.
>> >
>> > 2. Jens Lauritsen hasn't found time to port this to the new Stata graphics; like everybody else he is a very busy person.
>> >
>> > 3. Not many users have the Stata programming skills to write something as good or better, and it seems that none of them have the inclination to do this.
>> >
>> > 4. StataCorp can be as capricious as any bunch of academics in not doing stuff that doesn't interest them. They can speak for themselves, or not, but I don't sense that this particularly appeals to anyone at StataCorp.
>> >
>> > 5. Some may share my own personal view that while Venn diagrams are interesting mathematically and in the history of ideas they are of rather little use in data analysis.
>> >
>> > All likely to be very disappointing to anyone frustrated, no doubt, but surprising? I suggest not.
>> >
>> > (Michael can also speak for himself, but I think that his book does not purport to survey user-written programs at all.)
>> >
>> > Nick
>> > n.j.cox@durham.ac.uk
>> >
>> > Philip Burgess
>> >
>> > I'm trying to graph a Venn diagram using (STB-54)  gr34.3
>> >
>> > When I run - venndiag var1 var2 - it produces the tabular output
>> > correctly but crashes altogether when I gues it is trying to graph the
>> > output.
>> >
>> > I'm surprised that - findit venn - indicates that gr34.3 (2000) is the
>> > 'most' recent ado for Venn diagrams. I could find no reference to such
>> > in Michael Mitchell's (excellent) VGSG.
>> >
>> > I wonder whether there is an appropriate ado ora work around. Ideally,
>> > I want to generate areas that are poprtioned to the actual data.
>> >
>> > I'm using Stata/SE 11.1 (born 30 Sept 2010)
>> >
>> > *
>> > *   For searches and help try:
>> > *   http://www.stata.com/help.cgi?search
>> > *   http://www.stata.com/support/statalist/faq
>> > *   http://www.ats.ucla.edu/stat/stata/
>> >
>>
>>
>
> *
> *   For searches and help try:
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> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
David Elliott

Everything is theoretically impossible, until it is done.
Progress is made by lazy men looking for easier ways to do things.
 -- Robert A. Heinlein (American science-fiction Writer, 1907-1988)

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