Online Analysis Using SDA
Survey Documentation and Analysis (SDA) is an online data analysis system that allows users to explore data without having to download data files or setup files, and without requiring familiarity with any statistical package. Users may create custom subsets of records and/or variables and download the subsets. SDA was developed and is maintained by the Computer-assisted Survey Methods Program (CSM) at the University of California, Berkeley.
SAMHDA provides several resources to help users learn and use SDA for analysis of public-use data. One useful resource is CSM's Online Help Files for SDA Users. Also, many of the analytical terms and options within SDA have clickable links that produce online help documentation. Video tutorials for select SDA topics are provided on the ICPSR YouTube channel. A final help resource is SAMHDA's FAQ section: Help with Analyzing Data Online.
Almost all SAMHDA data collections are available for online data analysis. Currently, the National Youth Survey series (NYS), Drug Services Research Survey (DSRS) study and Services Research Outcomes Study (SROS) cannot be used with SDA; however, they still have html codebooks available. In some cases, only one part of a study is available for online analysis with SDA (e.g., Alcohol and Drug Services Study (ADSS)). SAMHDA also concatenates some studies, merging each part into a single SDA file, allowing for online analysis of all years of data available (e.g., Drug Abuse Treatment Outcome Study (DATOS), Drug Abuse Treatment Outcome Study-Adolescent (DATOS-A), National Treatment Improvement Evaluation Study (NTIES)).
There are two main ways to access SDA:
- The Analyze Online main navigation menu at the top of every SAMHDA webpage contains a link to the Analyze Online with SDA page. The Analyze Online with SDA page provides a list of all holdings archived in SAMHDA. Clicking on a colored bar expands the menu for a series or study. An arrow appears next to the online analysis links highlighted in yellow when online analysis options are available for a selected data file. The menu also provides access to the study or series home page, and links to view study documentation, download data, analyze data online, and access Quick Tables (when available).
- The study home page contains a link to analyze data online using SDA.