Supplemental Security Income (SSI) microdata documented in DDI 3 metadata


The Supplemental Security Income (SSI) Public-Use Microdata File contains an extract of data fields from the Social Security Administration's (SSA) Supplemental Security Record file. This dataset is used to demonstrate how to document variables and datasets in DDI 3.

Census 2010 in DDI 3 metadata


The 2010 Census is one of the most recognizable research questionnaires in the United States. The US Census is advertised on talk shows, in the media, and is mailed to every current home address. This familiarity makes the 2010 Census a great questionnaire to demonstrate some features of the DDI 3 metadata standard and its Data Collection component.