Item| Fields | Description | RequiredMandatory | DDI Documentation Content |
| Citation / Title | Description of dataset | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ResourcePackagePhysicalInstance/ |
FileFormat | Format of file | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/PhysicalStructure/?highlight=fileformat |
Case Identifier | Case identifier | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/LogicalRecordType/ |
DataFileURL | Where dataset can obtained e.g. DOI or website | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/PhysicalInstance/ |
CaseQuantity | Number of rows in dataset | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/GrossFileStructureType/?highlight=casequantity |
CreationSoftware | Name of software used to generate dataset | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SoftwareType |
Variable Name | Name of variable / column | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Variable/ |
Variable Description / Label | Variable label | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Variable/ |
Variable Type | String / Numeric / Time / Date etc | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/VariableRepresentationType/ |
Variable Format | Length / decimal / YYYMMMDD etc | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/VariableRepresentationType/ |
Code List | Codes available on question if appropriate | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/CodeList/ |
Minimum Value | Minimum value of numeric | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumberRangeType/ |
Maximum Value | Maximum value of numeric | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumberRangeType/ |
Valid | No. of cases with valid responses | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |
Invalid | No. of cases with invalid responses | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |
Frequency count | Count of coded values (valid / invalid) | No | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |
Frequency % | % of coded values (valid / invalid) | No | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |
Mean | Mean of numeric values | Yes | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |
STDV | Standard Deviation of numeric values | No | https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/SummaryStatisticType/ |