He meant to say no customers bought a lime, blueberry, and nothing else in the same shopping cart, i.e. #2=0, but even if you set intersection of lime and blueberries to zero you don't get a good Venn diagram.
I think he is trying to make a Venn diagram out of data that is not appropriate for it. You can try to draw the diagram to discover that, geometrically, it is impossible. This is because Venn diagrams contain regions for all 2^3 combinations of shopping cart items, but the data has some of those combinations being empty (Euler diagrams relax this rule). Google charts does not support Euler diagrams in general, as far as I know. ~Elijah On Mon, Oct 11, 2010 at 4:14 AM, Edward Tufte Fan <[email protected]> wrote: > 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? >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google Chart API" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/google-chart-api?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google Chart API" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-chart-api?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google Chart API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-chart-api?hl=en.
