Analyze Data Online

Online data analysis allows users to:

  • Produce analysis results very quickly (within seconds), even for large datasets with thousands of cases and variables
  • Create statistical tables from the research data without downloading the data file

NADAC data are available for online analysis free of charge. To access data files, users must login to ICPSR with a free ICPSR MyData account or an existing Google, LinkedIn, or Facebook account.

Online Data Analysis Using SDA

...allows users to explore and analyze the data without having to download the data and does not require familiarity with a statistical software package. The online data analysis system uses the Survey Documentation and Analysis (SDA) statistical software. Users may also create custom subsets of the data, e.g., subset of cases and/or subset of variables and download the subsets.

With SDA, users can:

  • Analyze the data online, i.e., use the data and software from the NADAC Website so the data and statistical software need not be on the data user's computer
  • Perform various types of analysis: frequencies and crosstabulation, comparison of means, correlation matrix, comparison of correlations, multiple regression, logit/probit regression
  • Search for variables of interest in a dataset
  • Review frequencies or summary statistics of key variables to determine whether the data have the needed information to conduct more analyses
  • Review frequencies or summary statistics for missing data
  • Produce simple summary statistics for reports
  • Recode and create new variables
  • Subset variables or cases into an SPSS, SAS, Stata, or comma-separated ASCII dataset for download (easy to do even with large data collections and saves time and storage when using personal computers)
  • Export results for use in spreadsheets and presentations
  • Browse the online codebooks

Learn more about online data analysis using SDA (PDF)

Simple Crosstab/frequency Feature

...is a tool that presents a streamlined interface for building tables.

With the Simple Crosstab/Frequency tool, users can:

  • Produce tables and graphs for any variable from a datasets available for use with this tool
  • Search for variables of interest in a dataset using the drop-down menu in the Row, Column, and Control fields
  • Review frequencies or summary statistics of key variables to determine whether the data have the needed information to conduct more analyses
  • Review frequencies or summary statistics for missing data
  • Produce tables and graphs for reports
  • Revise the display of the table and graph using options in the left panel of the output screen
  • Copy results and insert them into documents

Note: The weight variable appropriate for the selection of variables will be preselected if statistical weighting is required

The software powering this system, Survey Documentation and Analysis (SDA), was developed by the Computer-assisted Survey Methods Program at the University of California at Berkeley.

NADAC data are available for online analysis free of charge. To access data files, users must login to ICPSR with a free ICPSR MyData account or an existing Google, LinkedIn, or Facebook account.

Learn more about the Simple Crosstab/Frequency feature (PDF)

Quick Tables

...allows for the streamlined production of custom tables and graphs using preselected variables from a study.

With Quick Tables, users can:

  • Produce custom tables and graphs using variables in a drop-down menu
  • Filter the selection of cases (e.g., ages(18-24)
  • Select chart options
  • Revise the display of the table and graph using options in the left panel of the output screen
  • Copy results to insert into documents

NADAC data are available for online analysis free of charge. To access data files, users must login to ICPSR with a free ICPSR MyData account or an existing Google, LinkedIn, or Facebook account.

Learn more about Quick Tables (PDF)

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