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MetricsEmsEstimate
(25 Nov 2010,
ArthurRyman
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(raw view)
---+ ems:Estimate Domain entities: [[MetricsEmsProject][ems:Project]], [[MetricsEmsScenario][ems:Scenario]], [[MetricsEmsEstimate][ems:Estimate]], [[MetricsEmsBaseline][ems:Baseline]], [[MetricsEmsMeasurement][ems:Measurement]] %TOC% ---++ Description An ems:Estimate resource is a set of predictions based on the assumptions in some scenario. Each prediction may be either a single measure, a fact table, or a work breakdown structure. Since estimates involve uncertainty, they are descributed using probability distributions. ---++ Properties An ems:Estimate resource contains the [[MetricsEMS10RestApiDataModel#Standard_Properties][Standard Properties]] and the following properties: | *Property* | *Range* | *Type* | *Occurrence* | *Edits* | *Description* | | dcterms:identifier | datatype | xsd:string | exactly-one | read-only | An identifier that is unique within the ems:EstimateList resource. | | ems:estimateList | resource | [[MetricsEmsEstimateList][ems:EstimateList]] | exactly-one | read-only | The list that this resource is a member of. | | ems:scenario | resource | [[MetricsEmsScenario][ems:Scenario]] | exactly-one | read-write | The ems:Scenario resource that this resource is an estimate for. | | ems:predicts | local inline resource | [[MetricsEmsMeasureDistribution][ems:MeasureDistribution]] | zero-or-more | read-write | A measure distribution predicted by this estimate. | | ems:predictsTable | local inline resource | [[MetricsEmsFactDistributionTable][ems:FactDistributionTable]] | zero-or-more | read-write | A fact distribution table predicted by the estimate. | | ems:predictsWbs | local inline resource | [[MetricsEmsWorkBreakdownStructure][ems:WorkBreakdownStructure]] | zero-or-more | read-write | A WBS predicted by this estimate. | ---+++ dcterms:identifier See [[MetricsEMS10RestApiDataModel#dc_identifier][Domain Entities, dcterms:identifier]]. ---+++ ems:estimateList See [[MetricsEMS10RestApiDataModel#ems_entity_List][Domain Entities, ems:{entity}List]]. ---+++ ems:scenario The [[MetricsEmsScenario][ems:Scenario]] resource that defines the assumptions for this estimate. Note that the ems:Scenario resource MAY be modified after the ems:Estimate resource is created, and that some assumptions could have changed therby invalidating the estimate. An EMS 1.0 service implementation MAY prevent this type of modification using implementation-dependent access control and policy enforcement mechanisms, e.g. the service MAY prevent a scenario resource from being modifed after any estimate uses it. If the service permits ongoing modification of the scenario resource then it SHOULD maintain the revision history of each resource so that the revision of the scenario resource that was in effect when the estimate was created can be determined. ---+++ ems:predicts This property gives a prediction for this estimate. An estimate may have zero or more predictions. The object of this property is an inline [[MetricsEmsMeasureDistribution][ems:MeasureDistribution]] resource. A prediction is any quantity that may be measured for the project, e.g. schedule, staffing, scope. Predictions often involve imprecisely known quantities such as effort or quality. The uncertainty in predictions is expressed by giving a probability distribution for the predicted quantities. ---+++ ems:predictsTable Like ems:predicts, except that the object of this property is an inline [[MetricsEmsFactDistributionTable][ !ems:FactDistributionTable]] resource. ---+++ ems:predictsWbs Like ems:predicts, except that the object of this property is an inline [[MetricsEmsWorkBreakdownStructure][ !ems:WorkBreakdownStructure]] resource. ---++ Examples * [[MetricsEMS10PrimerInitiatingEstimation#Listing_of_ASAP_Estimate_Resourc][EMS 1.0 Primer, Listing of ASAP Estimate]] * [[MetricsEMS10PrimerInitiatingEstimation#Listing_the_Estimate_6648_Resour][EMS 1.0 Primer, Listing of Estimate 6648]] * [[MetricsEMS10PrimerInitiatingInvestmentRisk#Listing_of_Estimate_with_Quantil][EMS 1.0 Primer, Listing of Estimate with Quantile Function]] ---++ Comments Add your comments here: %COMMENT%
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Topic revision: r8 - 25 Nov 2010 - 20:01:51 -
ArthurRyman
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