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In my data mining course, we are working with a data set. I have to identity the ranges of each attribute. I am given the set of data for all 150 points and i am given the visualization (charts) of all attributes. However I do not know how to use that set of data or the charts to find the ranges of each attribute. I do not know what is meant by range either.

I'm working on the data set for Iris plants and I have three classes of the flower.

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  • $\begingroup$ Your question doesn't have enough information, however it looks like the attribute $A$ range is interval $[A_{min}, A_{max}]$ $\endgroup$
    – HEKTO
    Sep 8, 2019 at 14:44
  • $\begingroup$ There is a thing they call a dictionary. It tells you a lot about the meaning of words. $\endgroup$
    – user16034
    May 21 at 14:59

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The range of the attribute is the interval where the values of the attribute varies. For Real numbers, is the closed interval [min,max].

For example, for an attribute $A$ with values $\{0.1, 0.5 , 1 , 10 , 100\}$ the range is the interval $[0.1,100]$

The concept is also valid for Integers, however there are no widely know notation to describe that. Ways of describing it would be:

$i = 1,...,10$

or

$(i \in \mathbb{Z}) \wedge (i \in [0,10])$

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