Note:
If the Survey Documentation and Analysis (SDA) is available for a study, users will see a link to "online analysis" in the Search Results for that study. Under the study name and author, there may be up to four links: description, download, online analysis and related literature. Clicking on "online anaylsis" will take users to a page for the study from which they can access all SDA features. A clickable Online Analysis tab also appears on the description and download pages of relevant studies.
Online Analysis Using the Survey Documentation and Analysis
A selection of PHDCN 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.
- 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 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.
The following features of the online Survey Documentation and Analysis 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
NACJD Collections Available for Use With SDA
Variable-Level Searching
This feature searches the question text and variable and value labels for variables across all NACJD or ICPSR studies that are available for online analysis.
Here are some general guideline for using the variable-level search below:
- Searches are not case-sensitive.
- Quotation marks are interpreted literally - don't use them.
- Only whole words are matched - no wildcards or partial words.
- Try different forms of the search term or use synonyms (e.g., employ, employment, job, work).
- Be patient. This program searches thousands of variables and, therefore, it is sometimes slow.
- For more detailed information, see How do I search for specific variables?
