The Source for Crime and Justice Data

Analyze Data Online

Survey Documentation and Analysis (SDA)

A selection of NACJD data collections is available for online data analysis. This means that users can perform certain statistical procedures on the data, create custom subsets, or browse the codebook on the Web, without downloading the entire collection and importing the data into a statistical package.

Features of the Online SDA

This online Survey Documentation and Analysis uses the Survey Documentation and Analysis (SDA) program developed and maintained by the Computer-Assisted Survey Methods Program at the University of California, Berkeley. Online documentation for this system is available. In addition, NACJD offers a web-based SDA Tutorial; a video tutorial, An Overview of SDA and Its Features; and a webinar and corresponding PowerPoint slides, Analyze Data Online on Demand: An Introduction to SDA.

The following features of the online Survey Documentation and Analysis are currently available:

NACJD Collections Available for Use With SDA


Variable-Level Searching

The Social Science Variables Database (SSVD) enables ICPSR users to search for variables across datasets, compare results, and download data if desired.

Search results may be viewed individually, or in the context of the study and/or series to which they belong.

The SSVD currently includes variable-level documentation for approximately 2,000 studies, which represent about 40 percent of ICPSR's holdings that have setup files. This amounts to roughly 1.5 million variables.