Analyze Data Online
For some NACJD data collections, users can perform certain statistical procedures on the data, create custom subsets, or browse the codebook online, without downloading the entire collection and importing the data into a statistical package.
Survey Documentation and Analysis (SDA)
When a study is available for online data analysis, users can:
- Search for variables of interest in a dataset
- Review frequencies or summary statistics of key variables to determine what further analyses are appropriate
- Review frequencies or summary statistics for missing data
- Produce simple summary statistics for reports
- Create statistical tables from raw data
- Create a subset of cases or variables from a large collection to save time and storage space downloading to a personal computer
Features of the Online SDA
This online SDA program was 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 SDA are currently available:
- Browse the codebook for a dataset
- Perform certain statistical procedures, such as:
- List values of individual cases
- Frequencies
- Crosstabulations
- Comparisons of means
- Correlation matrix
- Ordinary Least Squares (OLS) regression
- Manipulate variables
- Recode variables
- Compute new variables
- List newly created variables
- Create customized subsets of selected variables and cases
- Download the entire collection or a customized subset, including:
- ASCII data file with optional delimiters
- SAS, SPSS, or Stata setup files
- Codebook customized for the selected subset