Hi ,
I do not quite understand.
You say:
#1> In my data, no customers bought a lime and a blueberry in the same
shopping cart.
However you also say
#2> Intersection between limes and blueberries: 18
Which is a contradiction.
Also you say:
#3> Intersection between all 3: 18
Which also contradicts #1

Can you re-check ?

--Ed


On Fri, Sep 10, 2010 at 8:44 PM, tsteil <[email protected]> wrote:

> This is a chart showing fruit sales. Customers can buy an apple, a
> lime, and/or a blueberry. I'm creating a venn diagram to see how many
> customers buy a signle thing, or multiple things.
>
> In my data, no customers bought a lime and a blueberry in the same
> shopping cart.
> They bought apples & limes, or apples & blueberries, or apples &
> blueberries & limes, but not only limes & blueberries.
> They also bought each fruit by itself.
>
> My data points:
> 64 apples
> 42 limes
> 50 blueberries
>
> Intersection between apples and limes: 20
> Intersection between apples and blueberries: 27
> Intersection between limes and blueberries: 18
>
> Intersection between all 3: 18
>
>
> The chart:
>
> http://chart.apis.google.com/chart?chs=500x500&cht=v&chco=FF6342,ADDE63,63C6DE&chd=t:64,42,50,20,27,18,18&chdl=Apples|Limes|Blueberries&chdlp=b&chtt=Venn%20Chart%20Weirdness
>
> Why does the venn chart show an intersection between limes and
> blueberries, if the intersection size of limes and blueberries is
> exactly the same size as the intersection between all 3?
>
> Is this a limitation of Venn charts?
>
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