http://qudt.org/schema/qudt/RatioScale
<p>A <em>Ratio Scale</em> possesses a meaningful (unique and non-arbitrary) zero value.
Most measurement in the physical sciences and engineering is done on ratio scales.
Examples include mass, length, duration, plane angle, energy and electric charge.
</p>
<p>In contrast to interval scales, ratios are now meaningful because having a non-arbitrary zero point makes it meaningful to say,
for example, that one object has "twice the length" of another (= is "twice as long").
Very informally, many ratio scales can be described as specifying "how much" of something (i.e. an amount or magnitude) or "how many" (a count).
The Kelvin temperature scale is a ratio scale because it has a unique, non-arbitrary zero point called absolute zero.
</p>
Instances of qudt:RatioScale can have the following properties:
| PROPERTY | TYPE | DESCRIPTION | RANGE |
|---|
By the associated SHACL property shapes, instances of qudt:RatioScale can have the following properties:
| PROPERTY | PROPERTY TYPE | DESCRIPTION | MIN | MAX | VALUE TYPE | OTHER CONSTRAINTS | GLOBAL RANGE |
|---|---|---|---|---|---|---|---|
| qudt:Scale | |||||||
| qudt:dataStructure | rdf:Property | 0 | 1 | xsd:string | -- | ||
| qudt:permissibleMaths | rdf:Property | 0 | * | qudt:MathsFunctionType | -- | ||
| qudt:permissibleTransformation | rdf:Property | 0 | * | qudt:TransformType | -- | ||
| qudt:scaleType | rdf:Property | 0 | 1 | qudt:ScaleType | -- | ||
| qudt:Concept | |||||||
| dcterms:description | rdf:Property | 0 | * | -- | |||
| dcterms:isReplacedBy | rdf:Property | 0 | 1 | -- | |||
dtype:code |
-- | 0 | * | -- | |||
| qudt:abbreviation | rdf:Property | <p>An abbreviation for a unit is a short ASCII string that is used in place of the full name for the unit in contexts where non-ASCII characters would be problematic, or where using the abbreviation will enhance readability. When a power of abase unit needs to be expressed, such as squares this can be done using abbreviations rather than symbols. For example, <em>sq ft</em> means <em>square foot</em>, and <em>cu ft</em> means <em>cubic foot</em>. </p> | 0 | 1 | xsd:string | -- | |
| qudt:deprecated | rdf:Property | 0 | 1 | xsd:boolean | -- | ||
| qudt:deprecatedInVersion | rdf:Property | Version number of the first QUDT release in which an entity was deprecated. | 0 | 1 | xsd:string |
sh:pattern
^\d+\.\d+\.\d+$
|
-- |
| qudt:exactMatch | owl:ObjectProperty | 0 | * | qudt:Concept | -- | ||
| qudt:guidance | rdf:Property | 0 | * | rdf:HTML | -- | ||
| qudt:hasRule | rdf:Property | 0 | * | qudt:Rule | -- | ||
| qudt:id | rdf:Property | <p>The "qudt:id" is an identifier string that uniquely identifies a QUDT concept. The identifier is constructed using a prefix. For example, units are coded using the pattern: "UCCCENNNN", where "CCC" is a numeric code or a category and "NNNN" is a digit string for a member element of that category. </p> <p>For scaled units there may be an addition field that has the format "QNN" where "NN" is a digit string representing an exponent power, and "Q" is a qualifier that indicates with the code "P" that the power is a positive decimal exponent, or the code "N" for a negative decimal exponent, or the code "B" for binary positive exponents. </p> | 0 | 1 | xsd:string | -- | |
| qudt:plainTextDescription | rdf:Property | A plain text description is used to provide a description with only simple ASCII characters for cases where LaTeX , HTML or other markup would not be appropriate. | 0 | * | -- | ||
rdf:type |
-- | 1 | * | -- | |||
| qudt:Verifiable | |||||||
| qudt:dbpediaMatch | rdf:Property | 0 | * | xsd:anyURI | -- | ||
| qudt:informativeReference | rdf:Property | Provides a way to reference a source that provided useful but non-normative information. | 0 | * |
sh:or
( xsd:anyURI | qudt:Citation )
|
-- | |
| qudt:isoNormativeReference | rdf:Property | Provides a way to reference the ISO unit definition. | 0 | * | xsd:anyURI | -- | |
| qudt:normativeReference | rdf:Property | Provides a way to reference information that is an authoritative source providing a standard definition | 0 | * | xsd:anyURI | -- | |
| qudt:wikidataMatch | rdf:Property | This property relates a QUDT concept to a Wikidata item. The Wikidata item is identified by the Wikidata URI, which is of the form `https://www.wikidata.org/wiki/Q{number}`. | 0 | 1 | -- | ||
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
qudt:RatioScale a rdfs:Class,
sh:NodeShape ;
rdfs:label "Ratio scale" ;
dcterms:description """
<p>A <em>Ratio Scale</em> possesses a meaningful (unique and non-arbitrary) zero value.
Most measurement in the physical sciences and engineering is done on ratio scales.
Examples include mass, length, duration, plane angle, energy and electric charge.
</p>
<p>In contrast to interval scales, ratios are now meaningful because having a non-arbitrary zero point makes it meaningful to say,
for example, that one object has "twice the length" of another (= is "twice as long").
Very informally, many ratio scales can be described as specifying "how much" of something (i.e. an amount or magnitude) or "how many" (a count).
The Kelvin temperature scale is a ratio scale because it has a unique, non-arbitrary zero point called absolute zero.
</p>"""^^rdf:HTML ;
qudt:informativeReference "https://en.wikipedia.org/wiki/Level_of_measurement"^^xsd:anyURI ;
rdfs:isDefinedBy <http://qudt.org/3.5.2/schema/shacl/qudt> ;
rdfs:seeAlso qudt:IntervalScale,
qudt:NominalScale,
qudt:OrdinalScale ;
rdfs:subClassOf qudt:Scale .