ems:FactDistributionTable
Metric entities:
ems:Measure,
ems:MeasureDistribution,
ems:FactTable,
ems:FactDistributionTable,
ems:Map,
ems:WorkBreakdownStructure
Description
A fact distribution table is a fact table that contains probability distributions instead of precise numeric values for its measures. Fact distribution tables are used in scenario assumptions (see
ems:assumesTable) and estimate predictions (see
MetricsEmsEstimate#ems_predictsTable).
A ems:FactDistributionTable resource represents a fact distribution table. It is similar in structure to an
ems:FactTable resource. It contains inline resources of type
ems:Head and
ems:DimensionCell which are defined in the data model of
ems:FactTable.
Properties
An ems:FactDistributionTable resource has the following properties:
Property |
Range |
Type |
Occurrence |
Edits |
Description |
dcterms:title |
datatype |
rdf:XMLLiteral |
exactly-one |
read-write |
A short title for the fact distribution table. Valid XHTML <span> element content. |
ems:head |
local inline resource |
ems:Head |
exactly-one |
read-write |
The head of the fact distribution table. |
ems:factDistribution |
local inline resource |
ems:FactDistribution |
one-or-more |
read-write |
A fact distribution row in the fact distribution table. |
dcterms:title
This required property gives a short title for the fact distribution table. Its datatype is XML literal and it MUST contain valid XHTML <span> element content.
ems:head
This required property contains an inline
ems:Head resource that defines the columns of the fact distribution table. The head of the table describes the data that the table contains.
ems:factDistribution
This multi-valued property refers to inline
ems:FactDistribution resources that are the rows of the fact distribution table. There MUST be one or more rows present in the fact distribution table.
ems:FactDistribution
This inline resource defines a row of a fact distribution table. It contains a set of dimension and measure distribution cells. The dimension and measure distribution cells MUST correspond exactly to the dimension and measure columns defined in the
ems:Head resource of the fact distribution table. Each dimension cell MUST refer to a unique dimension column and each dimension column MUST be referred to by a unique dimension cell. Each measure distribution cell MUST refer to a unique measure column and each measure column MUST be referred to by a unique measure distribution cell.
The correspondence between cells and columns is achieved in RDF/XML representations via resource identifiers. Each column defined in the head MUST have a unique identifier defined by an rdf:ID attribute. Each cell in a row MUST have an ems:inColumn property that refers to the column via an rdf:resource attribute.
An ems:FactDistribution resource has the following properties:
ems:dimensionCell
The value of this required property in an inline
ems:DimensionCell resource that holds the value of the dimension for a dimension column.
ems:measureDistributionCell
The value of this required property in an inline
ems:MeasureDistributionCell resource that holds the measure distribution for a measure column.
ems:MeasureDistributionCell
This inline resource contains a measure distribution in a row of a fact table.
It has the following properties:
Property |
Range |
Type |
Occurrence |
Edits |
Description |
ems:inColumn |
resource |
ems:MeasureColumn |
exactly-one |
read-write |
The identifier of the measure column of this cell. |
ems:distribution |
local inline resource |
ems:ProbabilityDistribution |
exactly-one |
read-write |
The probability distribution of the measure for this cell. |
ems:inColumn
This required property is the identifier of the corresponding
ems:MeasureColumn resource.
ems:distribution
This required property is the probability distribution of the measure, which is an inline resource of type ems:ProbabilityDistribution. The value of this property MUST be a resource that is one of the concrete probability distributions listed in
Probability Distribution Data Models.
Examples
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