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:
Property |
Range |
Type |
Occurrence |
Edits |
Description |
dc:title |
datatype |
xhtml:span |
exactly-one |
read-write |
A brief title for the measure. |
ems:metric |
resource |
rdf:Resource |
exactly-one |
read-write |
A URI that identifies the metric. |
ems:unitOfMeasure |
resource |
rdf:Resource |
exactly-one |
read-write |
A URI that identifies the unit of measure. |
ems:distribution |
local inline resource |
ems:ProbabilityDistribution |
exactly-one |
read-write |
The probability distribution of the measure. |
dc: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/software-metrics/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/terms/">
<dc:title>Total Duration in Months</dc:title>
<ems:metric
rdf:resource="http://open-services.net/software-metrics/schedule#duration" />
<ems:unitOfMeasure
rdf:resource="http://open-services.net/software-metrics/units#month" />
<ems:distribution>
<ems:PointEstimate>
<ems:numericValue>6</ems:numericValue>
</ems:PointEstimate>
</ems:distribution>
</ems:MeasureDistribution>
Measure Distribution 2
The following listing contains an ems:MeasureDistribution resource that describes an estimate of total size with a triangular distribution that peaks at 5000 ESLOC.
Listing of Measure Distribution 2
<?xml version="1.0"?>
<ems:MeasureDistribution xmlns:ems="http://open-services.net/software-metrics/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/terms/">
<dc:title>Total Size in ESLOC</dc:title>
<ems:metric rdf:resource="http://open-services.net/software-metrics/size#esloc" />
<ems:unitOfMeasure
rdf:resource="http://open-services.net/software-metrics/units#loc" />
<ems:distribution>
<ems:TriangularDistribution>
<ems:low>30000</ems:low>
<ems:mostLikely>50000</ems:mostLikely>
<ems:high>100000</ems:high>
</ems:TriangularDistribution>
</ems:distribution>
</ems:MeasureDistribution>
Comments
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Topic revision: r5 - 16 Apr 2010 - 12:25:36 -
ArthurRyman