The Understanding America Study Data Pages provide access to collected data, accessible for all registered users, unless currently under embargo. (Register here.) Non-registered users may explore the fielded UAS surveys and their individual variables, but cannot view or download data.

Several types of data are available for each UAS survey. These data may be linked using the unique UAS ID code (uasid). CESR does not release personal identifiers associated with these data to researchers, who may apply for "not human subjects" determinations from their local IRB for their analysis.

For download (generated nightly)

• Survey data file with collected data (in STATA or CSV format). Data files provide “clean” data, that is, answers given to questions that are not applicable anymore at survey completion (for example because a respondent went back in the survey and skipped over a previously answered question) are treated as if the questions were never asked. In the data files all questions that were asked, but not answered by the respondent are marked with “.e”. All questions never seen by the respondent (or any dirty data) are marked with “.a”. The latter may mean that a respondent did not view the question because s/he skipped over it; or alternatively that s/he never reached that question in the survey due to a survey break off. Data files are also cleaned to match the standard variables listed here. The mapping from the raw to the cleaned UAS standard variables can be found here.
• Weights are available for completed surveys and are part of the data file. Weights for a survey that is ongoing are by request (uas-weights-l@maillist.usc.edu). The following weight variables are included (detailed information on the UAS weighing procedures can be found here):
  • Base_weight: Base weights correcting for unequal sampling probabilities generated by the SIS algorithm (the algorithm used during sample recruitment).
  • Imputation_flag: A binary variable indicating whether any of the variables used within the post-stratification weighting procedure has been imputed.
  • Final_weight: Relative final post-stratification weights ensuring representativeness of the survey sample with respect to key pre-selected demographic variables. They are non-zero for respondents belonging to the nationally representative core sample and zero for respondents belonging to special purpose samples.
• Basic demographics of respondents (as collected in the My Household survey) who did not start the survey (in STATA or CSV format). Non-response data files are cleaned to match the standard variables following the aforementioned mapping. Note: on occasion only a respondent identifier will be available. This is the case when the respondent was invited to the survey, but had not done the My Household survey prior to being invited.
• Timings file containing three types of information for the time respondents spent:
  • Listing of the time spent per respondent for the interview as a whole (NOTE: any time spent on a screen longer than 5 minutes is excluded from this listing):
    • Uasid of the respondent.
    • Total time spent in seconds.
    • Total time spent in minutes.
    • Number of screens viewed by the respondent.
    • Average time spent per screen in seconds.
  • Listing of the time spent per question by all respondents combined (NOTE: any time spent on a screen longer than 5 minutes is excluded from this listing):
    • Total number of times.
    • Average time spent in seconds.
    • Average time spent in minutes.
  • Listing of each period of time spent per question by each individual respondent (NOTE: any time spent on a screen longer than 5 minutes is included in this listing. As such, the number of times a question is listed here may slightly differ from the total number of times a question is reported to have been shown in the listing of the time spent per question by all respondents combined):
    • Uasid of the respondent.
    • Time spent in seconds.
• Platform information file containing information about the type of device, operating system and browser used by the respondent. Please note that these are based on the user agent strings as reported by respondent’s browsers. Such browser-reported user agent strings are known to be limited in their accuracy, and as such, the provided platform information should be treated as indicative in nature (rather than as absolute). More information on browser user agent strings and their limitations can be found here. For details on how user agent strings are analyzed in the platform information file, contact us at uas-l@maillist.usc.edu.
• Codebook (PDF) describing the questions and skip logic of the survey. If a codebook is not available yet, a link to view the routing in the browser will be available instead.

Online only (provided real-time unless otherwise mentioned):

• Response rate (gross sample size, number of people started, number of people completed, number of people not started).
• Graphical timing distribution of the time spent by respondents on the survey.
• Tabular and graphical representation of the data for individual variables (NOTE: generated nightly).
• Survey information:
  • Author(s)
  • Sample selection
  • Respondent compensation
  • Field dates
  • Average time spent in minutes (NOTE: generated nightly)
  • Question details. NOTE: the standard demographics described here will differ from their mention in the survey codebooks. A description of the UAS Data Cleaning Process can be found here.

In addition to the above, the following can be provided on request:

• Item non response summaries.
• Custom extracts from the survey logs; for example, how often respondents went back and forth for a particular question.

Lastly, users can combine data from different studies so that a wealth of additional information can accessed at no additional charge (see for example the survey topics listed here).