ems:MeasureDistribution

Metric entities: ems:Measure, ems:MeasureDistribution, ems:FactTable, ems:FactDistributionTable, ems:Map, ems:WorkBreakdownStructure

Description

A measure distribution is like a measure except that it gives a probability distribution for the numeric value of a measure instead of a precise numeric value. Measure distributions are used in scenario assumptions (see ems:assumes and ems:assumesTable) and estimate predications (see ems:predicts and ems:predictsTable).

Properties

An ems:Measure resource has the following properties:

dcterms:title

This property gives a short, human-readable title for the measure.

ems:metric

This property gives a URI that identifies the metric. See Software Metrics Definitions for standard URIs.

ems:unitOfMeasure

This property gives a URI that identifies the unit of measure. See Software Metrics Definitions for standard URIs.

ems:distribution

This property gives 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

Measure Distribution 1

The following listing contains an ems:MeasureDistribution resource that describes an estimate of total project duration with a point estimate distribution of 6 months.

Listing of Measure Distribution 1

<?xml version="1.0"?>
<ems:MeasureDistribution xmlns:ems="http://open-services.net/ns/ems#"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcterms="http://purl.org/dc/terms/">
   <dcterms:title rdf:parseType="Literal">Total Duration in Months</dcterms:title>
   <ems:metric
      rdf:resource="http://open-services.net/ns/ems/schedule#duration" />
   <ems:unitOfMeasure
      rdf:resource="http://open-services.net/ns/ems/units#month" />
   <ems:distribution>
      <ems:PointEstimate>
         <ems:numericValue rdf:datatype="http://www.w3.org/2001/XMLSchema#double">6</ems:numericValue>
      </ems:PointEstimate>
   </ems:distribution>
</ems:MeasureDistribution>
 

Measure Distribution 2

Listing of Measure Distribution 2

<?xml version="1.0"?>
<ems:MeasureDistribution xmlns:ems="http://open-services.net/ns/ems#"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcterms="http://purl.org/dc/terms/">
   <dcterms:title rdf:parseType="Literal">Total Size in ESLOC</dcterms:title>
   <ems:metric rdf:resource="http://open-services.net/ns/ems/metric#Esloc" />
   <ems:unitOfMeasure rdf:resource="http://open-services.net/ns/ems/unit#Loc" />
   <ems:distribution>
      <ems:TriangularDistribution>
         <ems:low rdf:datatype="http://www.w3.org/2001/XMLSchema#double">30000</ems:low>
         <ems:mostLikely rdf:datatype="http://www.w3.org/2001/XMLSchema#double">50000</ems:mostLikely>
         <ems:high rdf:datatype="http://www.w3.org/2001/XMLSchema#double">100000</ems:high>
      </ems:TriangularDistribution>
   </ems:distribution>
</ems:MeasureDistribution>

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