The DataCollection element contains all of the metadata about the data collection process of the study or studies being described. This includes methodologies used for determining data sources, sample, and repetitions for data collection, question structures, flow logic for questionnaires (traditional or computer-assisted), and data processing occurring during data collection and data product creation. Includes information about the data collection and post-collection processing. Describes the coverage of the data collection activity. Other materials related to the data collection. Notes regarding the data collection metadata. Methodological metadata for the data collection. A set of metadata describing a data collection event. Several events may be described in a single data collection activity. Describes a set of questions used in the data collection. Several sets of questions may be used. A single scheme always is maintained by a single agency. A collection of control constructs used in data collection by one or more instruments. A collection of interviewer instructions used in data collection by instruments. A description of an instrument used in the data collection activity. Metadata regarding a processing event occurring as part of the data collection or data file preparation. MethodologyType describes the methodology used for data collection. Describes a methodology for data collection. Describes the time method or time dimension of the data collection. Describes the type of sample, sample design and provides details on drawing the sample. May include reference to the target sample size and the sampling fraction. Describes deviations from the sample design. Metadata regarding a software package used to instantiate a data collection method. Provides information regarding a data collection event. Reference to an organization, defined in the organziation scheme, responsible for the data collection Describes a source of the data. Provides a date or range of dates for the described data collection event as well as a cycle number when the collection is part of a series of data collection events. Documents the intended frequency of data collection, for example monthly, yearly, weekly, etc., preferably using an optional controlled vocabulary in the IntendedFrequency element. Date of first collection should be provided in StartDate as a basis for defining periodicity. EndDate should be entered for data collection cycles with a known or anticipated end date. EndDate is omitted in data collection series that are intended to be on-going. Describes the mode of collection. Describes the situation in which the data collection event takes place. Describes action taken to minimize loss of data from the collection event. Documents the intended frequency of data collection, for example monthly, yearly, weekly, etc., preferably using an optional controlled vocabulary in the IntendedFrequency element. Date of first collection should be provided in StartDate as a basis for defining periodicity. EndDate should be entered for data collection cycles with a known or anticipated end date. EndDate is omitted in data collection series that are intended to be on-going. Documents the intended frequency of data collection, for example monthly, yearly, weekly, etc., preferably using an optional controlled vocabulary Describes a source for the data. A description of the source from which data are collected. Describes the type of source, and may be from a controlled vocabulary. A citation or URI for the source of the data. Note that this is an external reference, and should not be used to point to DDI descriptions of the data, or to DDI-encoded data. A significant characteristic of the data source that may affect understanding or collection of the data. This will include the level of documentation of the source data. For example: 'Legibility of data source affected due to water damage.' SourceType allows for the provision of a term describing primary or secondary data sources, and may be from a controlled vocabulary. A citation or URI for the source of the data. Note that this is an external reference, and should not be used to point to DDI descriptions of the data, or to DDI-encoded data. Citation for the data source. URI to the data source. ProcessingType provides a structure for describing the processing within data collection. Describes a control operation. Describes a raw data cleaning operation. Describes the weighting used in the process. Information about the data appraisal. A structure for the description of the computation used in the data collection or data processing such as recoding, derivations, or incorporation of external data sources. Provides a structure for cleaning and control operations within a data collection process. A description of the operation. A reference to the listing in Organization of the agency responsible for the operation. Metadata regarding the appraisal of the collected data. A response rate. The sampling error of the data. Description of any other form of data appraisal. A structure for the description of the computation used in the data collection or data processing such as recoding, derivations, or incorporation of external data sources. Coding instructions that pertain to data collection or data processing overall such as handling of non-response to questions, imputation practices, suppression rules, etc. Coding instructions should be listed separately to allow for referencing of specific processes. Instructions for recodes, derivations from multiple question or variable sources, and derivations based on external sources. Instructions should be listed separately so they can be referenced by variables in the logical product. Coding instructions that pertain to data collection or data processing overall such as handling of non-response to questions, imputation practices, suppression rules, etc. Coding instructions should be listed separately to allow for referencing of specific processes. A human-readable description of the coding instruction. A machine-actionable command for processing the coding process. Used when attribute of the containing GeneralInstruction isOverride equals true. This element provides the reference to the GeneralInstruction that is being overriden.Used when attribute of the containing GeneralInstruction isOverride equals true. This element provides the reference to the GeneralInstruction that is being overridden. When changed to true, indicates that this coding instruction overrides a more generally used process. For recodes, derivations from multiple question or variable sources, and derivations based on external sources. Instructions should be listed separately so they can be referenced by variables in the logical product. Reference to a question used in the coding process Reference to a variable used in the coding process Reference to an external source of information used in the coding process, for example a value from a chart, etc. A human-readable description of the coding instruction. A machine-actionable command for processing the coding process. A control construct within the derivation instruction. Describes the aggregation. When set to true, the instruction describes a derivation. When false, indicates a simple recode. Describes the aggregation of a generation instruction. Provides detail on a variable set of dependent and independent variables. A reference to a variable set of dependent and independent variables. Provides detail on a variable set of dependent and independent variables. A reference to a variable, which is an important constraint for the computed aggregation measure and has the potential to invoke a change in a dependent variable like sex for average of income. A reference to a variable, for which the aggregate measure is computed like average of income. Reference to a variable or question used in the deriviation or coding instruction. Allows for assigning a mnemonic name used to reference this item in a command. series of interviewer instructuctions including routing information to be displayed within the instrument, definitions, and explanations of terminology and questions. A short description of the interviewer instruction scheme. A description of the use of the interviewer instruction scheme. Allows for inclusion by reference of other interviewer instruction schemes. A description of a particular interviewer instruction. A description of a particular interviewer instruction. A short description of the interviewer instruction. An image associated with the interviewer instruction, located at the provided URI. This provides the textual content of the instruction. Structures the metadata describing a collection instrument used in the data collection. Describes the type of the instrument, according to the documentor's type classification. Describes a software package associated with the collection instrument. A reference to an external representation of the data collection instrument. A reference to the control construct that initiates the sequence of the instrument content. A set of control constructs maintained by an agency, and used in the instrument. A set of control constructs maintained by an agency, and used in the instrument. A short description of the Control Construct Scheme. A further human-readable description of the Control Construct Scheme. Provides for inclusion by reference of external Control Construct Schemes. Extensible structure for control elements used in describing flow logic within the instrument.: IfThenElse, RepeatUntil, RepeatWhile, Loop, Sequence, ComputationItem, StatementItem, and QuestionConstruct. The global element ControlConstruct serves as the head of a substitution group for describing the order and flow of questions and supporting information within a data collection instrument. Provides the basic, extensible structure for control elements used in describing flow logic within the instrument. The only data point which is inherited by the extended constructs based on this type is the identification of the control construct. A pointer to an exteral aid presented by the instrument such as a text card, image, audio, or audiovisual aid. Typically a URN. Use type attribute to describe the type of external aid provided. Example of terms to use would include: imageOnly audioOnly audioVisual multiMedia. ExternalAid will be be available each time the control construct is invoked. Care should be taken when placing an ExternalAid in RepeatWhile, RepeatUntil and Loop constructs as it will recure each time the conditional statement is checked. This does not include interviewer instructions, which are handled separately. External reference to an interviewer instruction not expressed as DDI XML. Reference to an interviewer instruction expressed as DDI XML. Provides an if-then-else construct, so that if the stated condition is met, the Then clause is triggered, and otherwise the Else clause is triggered. The condition which must be met to trigger the Then clause, expressed as a Coding. The condition is an expression in the programming language used in the instrument. Reference to the control construct which should be triggered if the associated condition is met. Reference to the control construct which is triggered if the associated condition is not met. Structures the control construct which allows a Coding to be repeated until a specified condition is met. The condition which must be met to stop the repeated operation of the Coding in the associated UntilConstruct. The condition is an expression in the programming language used in the instrument. Reference to the Coding which runs until the UntilCondition is met. When the operation ceases, the flow returns to the containing control construct. Structures a control construct which repeats while a specified condition is met. Before each iteration the condition is tested. When the condition is not met, control passes back to the containing control construct. The condition which must be met to trigger the operation of the associated Coding. Reference to the Coding which is to be run when the associated condition has been met. Structures a control construct which loops until a limiting condition is met. The ControlConstruct contained in the Loop operates on the LoopVariable until the LoopWhile condition is met, and then control is handed back to the containing control construct. A reference to the variable (as used in the associated Codings) which is incremented or otherwise manipulated to meet the conditions stated in the LoopWhile condition. The initial value to which the LoopVariable is set. The condition which must be met for the Loop's functioning to cease; when this condition is met, control is handed back to the containing control construct. A Coding which is used to manipulate the LoopVariable after each iteration of the Loop's associated ControlConstruct element. A sequence of operations expressed as control constructs performed by the instrument. Used to assign a type to the control construct within the Sequence, according to a classification used by the Documentor. References control constructs in the order that they should appear within the instrument. If you are going to set the sequence to anything other than order of appearance the only allowable children are QuestionConstruct or Sequence. Contents must be randomizable. Structures a computational item by assigning a value to a variable. The Code which contains the value of the variable in programming terms. A reference to a variable to which the associated value in the Code element is assigned. A textual statement used in the Instrument. The string to be displayed in the instrument. A description of the string's purpose within the instrument. Structures the behavior of dynamic or static text within the instrument. The element containing the text. It is never used directly, but is always replaced by one of the derived elements in the substitution group for which the Text elements acts as the head. Text exists only to act as the head of a substitution group for the various types of derived text elements within the instrument. Provides a structure to be inherited by derivation for elements belonging to the substitution group of which the Text element is the head. A description of the text element. Literal (static) text to be used in the instrument. The value of the static text string. Text which has a changeable value, based on a condition expressed in Code. The condition on which the associated text varies. A set of questions maintained by an agency, and used in the instrument. A short description of the question scheme. A description of the use of the question scheme. Provides for inclusion by reference of external question schemes. An item (that is, a question) belonging to the Question Scheme. An item (that is, a question) belonging to the Question Scheme. Acts as the head of a substitution group for a set of derived question items. Structures the QuestionItem, and provides a structure inherited by other derived question item types. The text of the question presented in the instrument. this can occur multiple times for multi lingual questions. The purpose of the question vis-a-vis the data being collected. Contains a response domain for the question. Typically used to describe simple response domains (textual, numeric, etc.) Contains a response domain for the question. Typically used to describe simple response domains (textual, numeric, etc.) A reference to the concept associated with the response to the question. A pointer to an exteral aid presented by the instrument such as a text card, image, audio, or audiovisual aid. Typically a URN. Use type attribute to describe the type of external aid provided. Example of terms to use would include: imageOnly audioOnly audioVisual multiMedia. ResponseDomains should be chosen that do NOT duplicate responses such as CodeSchemes with overlapping codes. Be aware that certain instruments may collect responses in such a way that confusion between a code response and text response may be possible. The process of resolving such conflicts should be addressed in the data processing instructions. There is an assumption that if a text or numeric response duplicates a coded response to a question, that the value is that of the coded category. ResponseDomains should be chosen that do NOT duplicate responses such as CodeSchemes with overlapping codes. Be aware that certain instruments may collect responses in such a way that confusion between a code response and text response may be possible. The process of resolving such conflicts should be addressed in the data processing instructions. There is an assumption that if a text or numeric response duplicates a coded response to a question, that the value is that of the coded category. At least one ResponseDomain must be provided. Describes a multiple-question question item. Inherits from QuestionItem. Structures a multiple-question question item. The text of the top-level question presented in the instrument. This can occur multiple times for multi lingual questions. The purpose of the question vis-a-vis the data being collected. A reference to the concept associated with the response to the question. A pointer to an exteral aid presented by the instrument such as a text card, image, audio, or audiovisual aid. Typically a URN. Use type attribute to describe the type of external aid provided. Example of terms to use would include: imageOnly audioOnly audioVisual multiMedia. Prescribes the order in which the sub-questions should appear. A group of question items forming a group of sub-questions. Prescribes the order in which the sub-questions should appear. Structures a group of question items. A reference to a question item within the group. A reference to a multiple question item within the group. A response domain for a question item, used only as the head of a substitution group for the various derived types of response domains. Structures the construct which ties together questions and the programmatic logic of the control constructs. A reference to a question. Describes the sequencing of the response categories or response options to a question The response unit. The analysis unit, expressed as a term which may come from a controlled vocabulary. Reference to the description of the persons or other elements that are the object of the research and to which any analytic results refer. Structures the response domain for a Date, Time, or DateTime response. Label for the response domain as a human-readable string. A human-readable description of the response domain. Structures the response domain for a numeric response. May be a range or specific value, or a list of ranges. Label for the response domain as a human-readable string. A human-readable description of the response domain. Describes a coded response domain. Label for the response domain as a human-readable string. A human-readable description of the response domain. Structures a response domain based on categorization. Label for the response domain as a human-readable string. A human-readable description of the response domain. Structures the response domain for a geographic point to ensure collection of relevant information. The point may be associated with a polygon (such as the centroid of the polygon) or a line (end or shape points of a line). Label for the response domain as a human-readable string. A human-readable description of the response domain. External reference to an interviewer instruction not expressed as DDI XML. Reference to an interviewer instruction expressed as DDI XML. Describes the ordering of questions when not otherwise indicated. There are a set number of values for QuestionSequenceType, but also a provision for describing an alternate ordering using a command language. Describes the types of sequences of questions. In the order of appearance per the DDI instance, for each use. Randomly resorts sequence for each use. Rotates order of sequence for each use where first use is 1 2 3 4, second use is 2 3 4 1, third use is 3 4 1 2 etc. Any other means of reordering sequence. When value is Other, AlterativeSequenceType must be specified to describe the resequencing process. A generic element for specifying a further classification of an object. Note that this element can be substituted with an element that extends the reusable code type to restrict the possible values to an enumeration. Methodological metadata for the data collection. A set of metadata describing a data collection event. Several events may be described in a single data collection activity. Describes a set of questions used in the data collection. Several sets of questions may be used. A single scheme always is maintained by a single agency. Provides for inclusion by reference of one question scheme in another. A description of an instrument related to the data collection activity. Metadata regarding a processing event occurring as part of the data collection. Describes a methodology for data collection. Describes how time fits into the data collection methodology. Describes a sampling procedure. Describes deviation from a sample design. Describes a data source. A citation or URI indicating the origin of the data. Note that this is an external reference, and should not be used to point to DDI descriptions of the data, or to DDI-encoded data. A significant characteristic of the data source that may effect understanding or collection of the data. For example: legibility of data source affected due to water damage. Provides the intended frequency of data collection, for example monthly, yearly, weekly preferably using an optional controlled vocabulary in the attribute intendedFrequncy. Date of first collection should be provided in StartDate as a basis for defining periodicity. EndDate should be entered for data collection cycles with a known or anticipated end date. EndDate is omitted in data collection series that are intended to be on-going. Describes the mode of collection. Describes the situation in which the data collection event takes place. Describes action taken to minimize loss of data from the collection event. Describes a control operation. Describes a raw data cleaning operation. Describes the weighting used in the process. Information about the data appraisal. A description of the coding of the data within the process. A computational expression used in the coding. A reference to a source variable used as an input in the preceding Expression. The condition which must be met to trigger the Then clause, expressed as a Coding. The condition is an expression in the programming language used in the instrument. A reference to the control construct which should be triggered if the associated condition is met. A reference to the control construct which is triggered if the associated condition is not met. The condition which must be met to stop the repeated operation of the Coding in the associated UntilConstruct. The condition is an expression in the programming language used in the instrument. A reference to the Coding which runs until the UntilCondition is met. When the operation ceases, the flow returns to the containing control construct. The condition which must be met to trigger the operation of the associated Coding. A reference to the Coding which is to be run when the associated condition has been met. A reference to the variable (as used in the associated Codings) which is incremented or otherwise manipulated to meet the conditions stated in the LoopWhile condition. The initial value to which the LoopVariable is set. The condition which must be met for the Loop's functioning to cease; when this condition is met, control is handed back to the containing control construct. A Coding which is used to manipulate the LoopVariable after each iteration of the Loop's associated ControlConstruct element. The Code which contains the value of the variable. A reference to a variable to which the associated value in the Code element is assigned. The string to be displayed in the instrument. The text of the question presented in the instrument. The purpose of the question vis-a-vis the data being collected. A reference to the concept associated with the response to the question. Question items associated with the Question Item. A group of question items forming a group of sub-questions. Label for the response domain as a human-readable string. A reference to a question. The text of a response. The sampling error of the data. Description of any other form of data appraisal. The response unit. Coding instructions that pertain to data collection or data processing overall such as handling of non-response to questions, imputation practices, suppression rules, etc. Coding instructions should be listed separately to allow for referencing of specific processes. Instructions for recodes, derivations from multiple question or variable sources, and derivations based on external sources. Instructions should be listed separately so they can be referenced by variables in the logical product. Reference to a question used in the coding process. Reference to an element in the substitution group headed by the abstract element ControlConstruct. Provides for inclusion by reference of external Control Construct Schemes. Reference to a variable used in the coding process. Reference to an external source of information used in the coding process, for example a value from a chart, etc. Reference to an organization, defined in the organization scheme, responsible for the data collection. Reference to an organization, defined in the organziation scheme, responsible for the operation. External reference to an interviewer instruction not expressed as DDI XML. Reference to an interviewer instruction expressed as DDI XML. Provides a reference to the GeneralInstruction which the containing GeneralInstruction overrides. Provides a date or range of dates for the described data collection event as well as a cycle number when the collection is part of a series of data collection events. A pointer to an exteral aid presented by the instrument such as a text card, image, audio, or audiovisual aid. Typically a URN. Use type attribute to describe the type of external aid provided. Example of terms to use would include: imageOnly audioOnly audioVisual multiMedia.