Data Sharing for Demographic Research
A data archive for demography and population sciences

Access Restricted Data

How Does DSDR Protect Respondent Confidentiality?  ↓

DSDR ensures respondent confidentiality by removing, masking, or collapsing variables within public-use versions of the datasets. Sometimes these protective measures taken to reduce disclosure risk would significantly degrade the research potential of the data. In these cases, DSDR provides access to restricted use versions that retain confidential data by imposing stringent requirements for accessing these data.

What is Restricted Data?  ↓

DSDR frequently restricts the access and use of datasets containing information that might compromise the anonymity or privacy of individuals. In particular, any dataset that includes information regarding populations at higher risk of deductive disclosure (such as children, adolescents, prisoners, and parents) is especially likely to be released as restricted.

View a sample restricted use data agreement (pdf).

How Do I Access Restricted Data?  ↓

Users who wish to access restricted data must submit an application via ICPSR's online Data Access Request System (IDARS). By submitting an application via IDARS, users agree not to compromise the anonymity of individuals.

What is the ICPSR Data Access Request System (IDARS)?  ↓

DSDR offers a basic service allowing users to fill out an online application for restricted data access through the ICPSR Data Access Request System (IDARS). To access the IDARS system, users must sign on with a MyData account or with their Facebook or Google passwords. To learn more, please access this visual IDARS guide (pdf 203K).

After a researcher completes and submits the application, DSDR carefully reviews and approves the request. The data is then burned into a CD/DVD and mailed to the researchers. Please note that DSDR does not evaluate the validity of the research question; rather, we assess the security measures undertaken by the researcher to prevent disclosure risk.

Where is the Link to Log into IDARS?  ↓

Users can access the IDARS system through the following steps:

  1. Search for a study in the "Search Holdings" page
  2. Click on the desired study in the "Study Search Results" page
  3. Navigate to the "Access Notes" section of the study page
  4. Click on "apply online for access to the data"

To learn more, please view this visual guide to accessing IDARS (pdf 875K). Users wishing to access Add Health data can also refer to the Add Health restricted data page for links to log into IDARS.

How Long Does it Normally Take to Receive Restricted Data?  ↓

The time it takes for a researcher to receive restricted data varies and depends on several factors. These factors include the quality and completeness of the researcher's application and the number of applications DSDR receives at any given time. On average it takes 3 to 5 weeks for an application to be approved and for the data to be shipped to the researcher.

Information about Add Health Restricted Use Data Agreements

This is just a reminder that Add Health Restricted-use Data Agreements with DSDR will be transferred to the Carolina Population Center (CPC) on Tuesday, July 1, 2014 and these data will no longer be disseminated by DSDR after the close of business on Monday, June 30, 2014. Information on securing restricted-use Add Health data through CPC can be found on their website. The public-use version of Add Health data will continue to be disseminated by DSDR. Please direct questions to DSDR Staff at DSDR@icpsr.umich.edu