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. The Online Analysis Tutorial is a resource that provides a guided interactive tour of some of the most commonly used features of SDA. Another 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 (e.g., Alcohol and Drug Services Study (ADSS)). SAMHDA also concatenates some studies, merging each part into a single SDA file (e.g., Drug Abuse Treatment Outcome Study (DATOS), Drug Abuse Treatment Outcome Study-Adolescent (DATOS-A), National Comorbidity Survey: Baseline (NCS-1), National Treatment Improvement Evaluation Study (NTIES)).
There are three ways to access SDA:
- The Analyze Online main navigation menu at the top of every SAMHDA Web page contains a link to Analyze Online (with SDA). This link leads to the Analyze Online page, which provides a list of all holdings archived at SAMHDA. Click on a colored bar to expand the menu for a series or study. The menu 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). An arrow appears next to Online Analysis, when this option is available for a selected data file.
- The series home page contains a drop-down menu for studies or study parts that can be analyzed online using SDA.
- The study home page contains a link to analyze data online using SDA.