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
dc: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.

dc: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 local resource identifiers. Each column defined in the head MUST have a unique local identifier defined by an rdf:node attribute. Each cell in a row MUST have an ems:inColumn property that refers to the column via an rdf:nodeID attribute.

An ems:FactDistribution resource has the following properties:

Property	Range	Type	Occurrence	Edits	Description
ems:dimensionCell	local inline resource	ems:DimensionCell	one-or-more	read-write	A cell that holds a dimension value for a dimension column.
ems:measureDistributionCell	local inline resource	ems:MeasureDistributionCell	one-or-more	read-write	A cell that holds a measure distribution for a measure column.

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	local resource	ems:MeasureColumn	exactly-one	read-write	The local 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 local 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

• EMS 1.0 Primer, Listing of Defect Arrival Rate Measurements

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