Statistical Data Types

Numerical

Categorical

Discrete Data
* Can be counted 
* Finite or infinite
* Integers or Natural numbers
* Interval scale 
* Eg., number of samples
Continuous Data
* Measured 
* Finite or infinite
* Real number 
* Ratio scale
* Eg., welding current, sheet thickness
Ordinal Data
* Numbers placed in categories have meaning 
* May be "averaged"
* Eg., failure mode 
Nominal Data
* Arbitrary labels
* No intrinsic order 
* Eg., material grade, coating type
Binary Data
* Only two values 
* Eg., expulsion yes/no
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