The EvidenceVariable resource describes an element that knowledge (Evidence) is about. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. If the element is present, it must have either a @value, an @id, or extensions An absolute URI that is used to identify this evidence variable when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which an authoritative instance of this evidence variable is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the evidence variable is stored on different servers. A formal identifier that is used to identify this evidence variable when it is represented in other formats, or referenced in a specification, model, design or an instance. The identifier that is used to identify this version of the evidence variable when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the evidence variable author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence. To provide a version consistent with the Decision Support Service specification, use the format Major.Minor.Revision (e.g. 1.0.0). For more information on versioning knowledge assets, refer to the Decision Support Service specification. Note that a version is required for non-experimental active artifacts. Indicates the mechanism used to compare versions to determine which is more current. A natural language name identifying the evidence variable. This name should be usable as an identifier for the module by machine processing applications such as code generation. A short, descriptive, user-friendly title for the evidence variable. The short title provides an alternate title for use in informal descriptive contexts where the full, formal title is not necessary. Display of the suggested method of how to cite this EvidenceVariable. The status of this EvidenceVariable. Enables tracking the life-cycle of the content. A Boolean value to indicate that this resource is authored for testing purposes (or education/evaluation/marketing) and no version of this resource will ever be intended for genuine usage. The date (and optionally time) when the evidence variable was last significantly changed. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the evidence variable changes. An individiual or organization primarily involved in the creation and maintenance of the content. The name of the organization or individual responsible for the release and ongoing maintenance of the evidence variable. Contact details to assist a user in finding and communicating with the publisher. The person or entity that entered the data into the EvidenceVariable Resource instance, if different than the author or creator of the intellectual property contained within the EvidenceVariable Resource instance. An individual or organization primarily responsible for internal coherence of the content. An individual or organization asserted by the publisher to be primarily responsible for review of some aspect of the content. An individual or organization asserted by the publisher to be responsible for officially endorsing the content for use in some setting. A natural language summary of the evidence variable. A human-readable string to clarify or explain concepts about the resource. The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate evidence variable instances. Explanation of why this EvidenceVariable is needed and why it has been designed as it has. A copyright statement relating to the EvidenceVariable and/or its contents. Copyright statements are legal notices of intellectual property ownership and may include restrictions on the use and publishing of the EvidenceVariable. A short string (<50 characters), suitable for inclusion in a page footer that identifies the copyright holder, effective period, and optionally whether rights are restricted . (e.g. 'All rights reserved', 'Some rights reserved'). The date on which the resource content was approved by the publisher. Approval happens once when the content is officially approved for usage. See guidance around (not) making local changes to elements [here](canonicalresource.html#localization). The date on which the resource content was last reviewed. Review happens periodically after approval but does not change the original approval date. The period during which the resource content was or is planned to be in active use. Relationships that this EvidenceVariable has with other FHIR or non-FHIR resources that already exist. True if the actual variable measured, false if a conceptual representation of the intended variable. The meaning of the evidence variable. Further specification of the definition. The method of handling in statistical analysis. A grouping for dichotomous, ordinal, or polychotomouos variables. The context, situation, or parameters that determine whether the data is obtained to determine the value of the variable. Classification of the variable. How the data element is organized and where the data element (expressing the value of the variable) is found in the dataset. When the variable is observed in relation to a reference point in time defined by context or event. When the variable is observed in relation to calendar dates and times. Limit on acceptability of data used to express values of the variable. A method or transformation applied for missing data. A method or transformation applied for data that does not match required patterns. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. The type of relationship to the related artifact. The artifact that is related to this EvidenceVariable Resource. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. Attribute of the definition. Specification of the definition attribute. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. Description of the grouping. Definition of the grouping. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. The type of data used to express values of the variable. The mapping (order of elements) to reach the element containing the data element in the dataset. A character or series of characters that is used within a string to signal the separation of discrete values. A part of the value for a variable that is stored in 2 or more parts. The EvidenceVariable resource describes an element that knowledge (Evidence) is about. The context, situation, or parameters that determine whether this constraint applies. The lowest permissible value of the variable, used with variables that have a number-based datatype (with or without units). The highest permissible value of the variable, used with variables that have a number-based datatype (with or without units). The earliest permissible value of the variable, used with variables that have a date-based or dateTime-based datatype. The latest permissible value of the variable, used with variables that have a date-based or dateTime-based datatype. The lowest number of characters allowed for a value of the variable, used with variables that have a string-based datatype. The highest number of characters allowed for a value of the variable, used with variables that have a string-based datatype. A rule, such as a format or other expectation, for the data values. A rule, such as a format or other expectation, for the data values, expressed as an Expression. List of anticipated values used to express value of the variable, used with variables that have a codeable concept-based datatype. List of anticipated values used to express units for the value of the variable, used with variables that have a Quantity-based datatype. Whether the value expressed for a variable is allowed to not be restricted to the expected value set.