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The formula for breaking a sequence of values into groups of equal ranges is:

max - min / number of categories

I would like to know why is it necessary to subtract the maximum value from the minimum value?

Thanks

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That captures all of your data. If it was smaller range it wouldn't, and if it was bigger, who cares about the extra stuff where your data doesn't exist?

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Ah I see, I did suspect as much. Many Thanks! –  Imran Azad May 5 '12 at 1:10

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