The types of variables are: qualitative and quantitative. The qualitative ones can be: nominal and ordinal. The quantitative ones can be: discrete and continuous. The discrete variables take a finite number of values. The continuous variables take an infinite number of values. Examples of discrete variables are: the number of siblings of a person, the number of chairs in a room, the number of planets in the solar system, etc. The continuous variables are those that can be measured. For example: length (3.5 m), mass (9.2 kg), temperature (27.6 'C) and time (31.3 s). But time is not only continuous by taking infinite values, but by increasing in value continually. That is why this characteristic of time is represented by C2 (C is continuity, 2 is double).
A time interval (duration) can be 15.6 minutes, but time never stops. C2 is the proof that time passes or flows.
Elvis Sibilia
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