Carroll diagrams.. ?

6 replies

anteater · 21/03/2006 17:35

dd1 has forgot her text book but remembered her homework.. Questions all about Carroll diagrams, anyone know what they are?

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Original poster

anteater · 21/03/2006 17:57

Someone must know, just soent 20 useless mins working thro the rubbish google answers...

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WigWamBam · 21/03/2006 17:59

They're rectangular grids that sort by yes/no answers - so if you were going to sort numbers by whether they were odd or even, you would have a grid of four rectangles, two underneath the other, with "odd" and "even" in the top two grids, then the numbers sorted in the rectangles underneath.

That sounds crap; let me see if I can find something on google that might explain it better!

RTKangaMummy · 21/03/2006 17:59

Aren't they like VENN diagrams

WigWamBam · 21/03/2006 18:00

Have a look at \link{http://io.uwinnipeg.ca/~jameis/Math/L.venn/LEY1.html\this} - part way down. Which strangely enough uses odd and even to demonstrate!

Original poster

anteater · 21/03/2006 18:02

Thank you!

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alibubbles · 21/03/2006 18:06

Carroll diagrams are rectangular tables that display data in a yes/no way. They are named in honour of Lewis Carroll, the pseudonym of the author of Alice in Wonderland. He was a mathematician who specialized in symbolic logic.

Suppose you have 1, 2, 3, 4, 5, 6, 7, and one attribute - evenness. The Carroll diagram for this is:

even not even

2 4 6 1 3 5 7

but do it in a table form ( can't draw boxes on here)

Flip