Quantity¶
A quantity is a representation of a quantifiable (standardized) aspect (such as length, mass, and time) of a phenomenon (e.g., a star, food, or a molecule). Quantities are classified according to similarity in (implicit) metrological aspect, e.g. the length of my speedboat and the length of my racing car are classified as length.
IRI: https://w3id.org/citydata/21972/v1/Quantity
Diagram¶
Specializations of Quantity¶
| Class | Description |
|---|---|
| Cardinality | Cardinality of the Population. |
| Note that there is no property that links Cardinality to a Variable. | |
| Difference Indicator | Difference between term_1 and term_2 (term_1 - term_2) |
| Distinct_count | Distinct_count class that is a Parameter that represents |
| the number of distinct values of a property of the members of a | |
| Population | |
| Indicator | An indicator is a quantity that is a ratio of a numerator and denominator that are also quantities. It has a city and time period associated with it. The numerator and denominator quantities can have different units of measure. One example of a unit of measure is the size of a population. A population_cardinality_unit is defined to be an individual of a Cardinality_unit that is a subclass of a Singular_unit. |
| Mean | Mean represents the mean value of a property all members of the Population have and is specified by the parameter_of_var property. |
| Parameter | Parameter is the Class of all measures that can be made of a Population, both statistical, e.g., Mean, Standard_devation, and others, e.g., Cardinality, Sum. |
| Ratio Indicator | |
| Standard_deviation | |
| Sum | Sum defines the sum over a variable possessed by members of the Population. |
| Sum Indicator | Sum of term_1 and term_2 (term_1 + term_2) |
Formalization for Quantity¶
| Property | Constraint |
|---|---|
| hasUnit | only Unit_of_measure |
| hasUnit | exactly 1 |
| hasUnit | exactly 1 Unit_of_measure; only Unit_of_measure |
| hasValue | only Measure |
| hasValue | exactly 1 |
| hasValue | exactly 1 Measure; only Measure |
| unit_of_measure | only Unit_of_measure |
| unit_of_measure | exactly 1 |
| unit_of_measure | exactly 1 Unit_of_measure; only Unit_of_measure |
| value | only Measure |
| value | exactly 1 |
| value | only Measure; exactly 1 Measure |
| subClassOf | ISO21972Thing |