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There are two basic types of measured data: discrete and continuous variables. ''Discrete variables'' are measurements that can only be represented by counted values. For example, the number of limestone beds in a formation or the number of producing wells in a field can only be whole numbers. ''Continuous variables'' can have any value within the scale of measurement. Gamma ray log values, the porosity or permeability of a rock, or the subsea elevation of a formation are examples of continuous variables. They can have fractional values and can even have values the same as a previous sample.

There are two basic types of measured data: discrete and continuous variables. ''Discrete variables'' are measurements that can only be represented by counted values. For example, the number of limestone beds in a formation or the number of producing wells in a field can only be whole numbers. ''Continuous variables'' can have any value within the scale of measurement. [[Basic open hole tools#Gamma ray|Gamma ray]] log values, the porosity or permeability of a rock, or the subsea elevation of a formation are examples of continuous variables. They can have fractional values and can even have values the same as a previous sample.

==Variability==

==Variability==