SDA Online Analysis

     SDA is a set of programs for the documentation and Web-based analysis of survey data. There are also procedures for creating customized subsets of datasets. This set of programs is developed and maintained by the Computer-assisted Survey Methods Program (CSM) at the University of California, Berkeley.

     SDA is a set of programs for Survey Documentation and Analysis. 

     Codebooks: SDA programs can produce codebooks either for printing or for browsing on the Web. Some examples of HTML codebooks that can be produced are available in the SDA Archive. The documentation for each study contains a full description of each variable, indexes to the variables, and whatever study-level information is available. Additional studies will be added from time to time. 

     Analysis: You can also analyze the data from the studies documented here. Crosstabulation, the comparison of means, the comparison of correlations, regression and other analysis programs are available online. Data analysis programs in the package are designed to be run from a Web browser. SDA provides analysis results very quickly -- within seconds -- even on large datasets with millions of cases. Although many of our users assume we are using some sort of super computer to achieve these speeds, the secret lies solely in the method of storing the data and the design of the programs. The SDA Archive runs on a low-cost (Intel) Linux server -- although versions are also available for Windows and (Sparc-based) Solaris.

     Subsetting: Another procedure available in the Web archive allows users to generate and download a subset of many of the data files in the archive. In addition to generating the data file, the subset procedure produces a codebook for the subset and data definitions for SAS, SPSS, Stata and DDI (XML).

TSpower

     A geographic information system (GIS), or geographical information system captures, stores, analyzes, manages, and presents data that is linked to location. Technically, GIS is geographic information systems which includes mapping software and its application with remote sensing, land surveying, aerial photography, mathematics, photogrammetry, geography, and tools that can be implemented with GIS software. Still, many refer to "geographic information system" as GIS even though it doesn't cover all tools connected to topology.

     In the strictest sense, the term describes any information system that integrates, stores, edits, analyzes, shares, and displays geographic information. In a more generic sense, GIS applications are tools that allow users to create interactive queries (user created searches), analyze spatial information, edit data, maps, and present the results of all these operations.

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