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