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What is a Nominal Attribute?
 Names, things. labels or names
 There is no ordering
 Math is meaningless on these
 However, can determine mode
 Sometimes called categorical

What is a binary attribute?
 Only has two values (i.e. male/female, 0/1)
 Symmetric  both values have equal weight.
 Assymetric   one value is more important

What is an Ordinal Attribute?
 Is a meaningful ranking among variables
 i.e. clerk, manager, CEO etc...
 Although there is ordering, distance between ranks is not defined.

What is the difference between an Interval scaled and Ratio scaled.
 Interval scaled  do not have a zero
 Ratio scaled  has a true zero

What is a discrete variable?
 has a finite or countable amount of possiblilites
 ordinal variables are considered discrete

What is a continuous variable?
Has an infinite number of variables

What is the formula for variance?
 How spread out the data is
 n= number of values
 xi = each number

What is the formula for standard deviation?
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