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Users can select questions to save to their iPOLL folder by checking the boxes next to the questions on the search results page, then clicking the “Add to My iPOLL Folder” button.  Individual questions can also be added from the question-level screen by clicking the plus icon in the bottom-right corner. Users can view all questions in their folder at any time by clicking “View folder.” The contents of the folder can be downloaded as a .txt or .csv file. Users who are logged in to their personalized accounts can download up to 500 questions at once; others will be limited to 50.

The contents of My iPOLL Folder will be cleared at the end of a user session. Please download any data you intend to save.

The individual-level results of a survey, conceptualized as a table or “matrix.” The rows contain values for each individual’s coded responses to the questions asked (contained in the columns.) For more, see What is a datasets?

RoperExplorer is a feature that allows users to generate their own crosstabs to compare responses on two questions from a survey without having to use a statistical software program. For example, a user might look at attitudes about abortion by the respondents’ age or examine whether people who say climate change is a serious problem are more likely to support regulation on industry.

Users must be logged into their personalized account to use RoperExplorer.

First select as your row question the question you are looking to analyze. This question is also referred to as the dependent variable —a question that depends on other factors. For example, take the question:  Do you think abortion should be legal in all cases, legal in most cases, illegal in most cases or illegal in all cases? Responses to this question could depend upon several factors, such as age, sex, or religiosity.

Then select your column question, also called the independent variable. This type of question is typically not changed by other factors and is often a demographic, such as sex or age.  The independent variable is the question you hypothesize will influence the dependent variable.

In making your selections for row and column, try asking yourself:  does the column question (independent variable) cause the row question (dependent variable) to change.

Those are the raw numbers, the exact number of respondents answering in each way.

In order to get statistically meaningful results, RoperExplorer removes any column response category with fewer than 100 respondents. Small samples, including subgroups of less than 100 people, increase the margin of sampling error significantly.  Suppressing these small sample groups prevents the user from inadvertently drawing conclusions that overstate the findings.

Yes. RoperExplorer uses the same weighting variable to weight the results as the polling organization that created the dataset used when analyzing the data for public release.

We would love to make Roper Explorer available for every survey we have. Unfortunately, that’s not possible. We have over 22,000 datasets, some of which are still in older formats. In some cases, the only data we have is the topline data – that is, the results from the total sample, without a dataset to allow further analysis. Staff are continuing to process the most current studies in this form and working hard to make Roper Explorer available for as many questions as possible as fast as we can.

At the top of the page, just above the three steps, there is a source citation for the survey that you are running. At the end of the citation, the link View Codebook will open a copy of the questionnaire and the codes for the survey in a separate PDF file.

In terms of pricing Roper Center membership, Doctoral Extensive refers to institutions which grant more than 50 PhDs per year in the social sciences, or other fields that use public opinion data. Doctoral Intensive institutions would be those which grant 50 or fewer PhDs per year.

Email your questions or problems to

Monday through Friday from 8:00 am-5:00 pm Eastern Standard Time.

No, the Roper Center does not conduct surveys. There is commercial survey firm by the name of Roper Public Affairs that conducts surveys and with whom we share founding fathers, but has nothing to do with the Roper Center archives. It’s likely that is the firm that is contacting you to complete one of their polls.

No, the Roper Center does not conduct surveys; it is a library of survey data collected by others who graciously permit the Center to archive and make their findings available to a broader research community.

Both the Roper Center and ICPSR provide access to social science data. The Roper Center focuses on public opinion data primarily collected by commercial and media survey organizations, while ICPSR archives broader based social science data from academic or government sources. Public opinion data is a small portion of the ICPSR collection and overlaps only slightly with the Roper Center’s collection of polls.

You can use iPOLL and documentation to Roper Center data to get ideas about how to ask questions. However, the Roper Center does not conduct surveys or provide detailed advice on survey design.

There is no connection today between the non-profit Roper Center for Public Opinion Research at the University of Connecticut and the for-profit Roper Poll owned by GfK Group.  Public opinion pioneer Elmo Roper founded both organizations, but they are completely separate entities.

The Roper Center archives datasets from thousands of public opinion surveys based on a variety of samples including adult populations of numerous countries and sub-national regions (states, provinces, etc.) as well as other special populations.

For surveys with U.S. national adult or major subpopulation samples (such as registered voters, women, or African Americans), iPOLL can be used as the primary finding aid to locate datasets on particular topics or for specific time periods. For state, foreign, and other special samples, the Search for Datasets tool should be used to locate datasets by searching for keywords that would be found in the abstract of the surveys, interview dates, country, survey organization, or type of sample.

Once datasets are located, members use the feature RoperExpress to download of the data. Non-members should contact for a cost quotation.

RoperExpress is a data access tool for on-demand download of datasets. Faculty and students at Member institutions have unlimited access to those datasets in the Roper Center collection that are in ASCII or SPSS portable formats. Simply conduct a search for datasets and the studies accessible for immediate download in RoperExpress will be marked with an icon: express_logo_sm.   Log in with your personalized account to complete the download.

No, the Roper Center does not conduct surveys; it is a library of survey data collected by others who graciously permit the Center to archive and make their findings available to a broader research community.

Members can access datasets through RoperExpress, which provides immediate downloads for members signed into their personalized accounts.

For non-members, datasets may be ordered by contacting Data Services and providing the complete dataset title from the abstract, including study number (e.g., Pew Research Center: India Winter 2014 Survey [INPEW2013-12]).  Datasets are delivered on CD-Rom or via password-protected direct download.

The typical turn-around-time for a dataset order is two weeks or less.

Non-members are welcome to order data from the Roper Center. Capture the dataset(s) title and archive number (e.g., NBC News/Wall Street Journal Poll: Barack Obama/Economy [USNBCWSJ2010-9500]) and forward it to Data Services at for a price quote. For more information on the price of datasets for non-members visit Roper Center Fees

“Field Dates” reflect the dates on which the survey was undertaken by the survey organization. “Release Date” is the date the survey organization made the results available to the public. “Posted Date” is the date the survey was entered into the iPOLL Databank.

For questions pertaining to restricted data, contact the Data Services at

Guidelines for bringing Roper Center ASCII data files into Stata are provided at ASCII-to-STATA where Roper members have the opportunity to download sample Stata do files with their corresponding datasets and codebooks.

Guidelines for bringing Roper Center ASCII data files into SPSS are provided at ASCII-to-SPSS where Roper members have the opportunity to download sample SPSS syntax files with their corresponding datasets and codebooks.

The documentation for a given survey usually gives basic information on sampling procedures. Working with data contributors, the Center is currently enhancing efforts to provide more complete methodological details. Please contact us for additional information.

Most datasets from before the 1990s are ASCII (“raw data”) format. Many more recent datasets are SPSS portable files. Some older, particularly non-US studies are in column-binary formats. Center staff will convert these to more contemporary formats (ASCII or SPSS) for members upon request. For additional information view, Definition of Data File Extensions.

iPOLL is the most comprehensive, up-to-date source for US nationwide public opinion available today. A full-text retrieval system, the iPOLL online database is organized at the question-level. The system allows for users to sift through over 600,000 questions archived from national public opinion surveys since 1935. The database is updated daily.

iPOLL includes data survey results from academic, commercial and media survey organizations such as ABC News, the Gallup Organization, Pew Research Centers, Kaiser Family Foundation, and many more. The data come from all the surveys in the Roper Center archive that have US national adult samples or samples of registered voters, women, African Americans, or any subpopulation that constitutes a large segment of the national adult population. iPOLL does not include state samples or foreign samples (see Catalog of Holdings/Search for Datasets), however, surveys of these populations are available from the Roper Center.

To retrieve all questions from an entire survey, regardless of when the questions were published, simply search for the survey organization using the organization pull-down menu and the beginning interview date using the date boxes on the search form. It is important to note that the date criteria used on the search form searches on the FIRST date of the interview period.

The Search for Datasets includes only those surveys for which the Roper Center holds the datasets (microdata or individual level), with brief descriptions of each. These include national, state, and foreign surveys, as well as special samples such as leaders or youth. iPOLL contains the aggregated question-level results from the US national surveys in the catalog, as well as a great deal of additional survey data from news releases and survey reports. Click here to find out what the difference is between a top-line and a dataset.

Like Search for Datasets, iPOLL can help you identify U.S. datasets that are rich in specific subject areas. However, because iPOLL provides the text and topline responses for all the questions, it makes selecting datasets easier and offers an appropriate context in which to review data, by comparing various questions and sources on the same topic and trend lines. Questions in iPOLL are linked to the Catalog study descriptions and often the questionnaires.

Typically internet surveys are not included in iPOLL, though several studies have been included as part of larger collections such as CBS News Polls. The methodology involved in internet polling is still a subject of contentious debate among survey professionals. We do have the results of some Internet surveys at the Roper Center, but they are not at present entered into the iPOLL database on a regular basis. (See Statement About Internet Polls by NCPP Polling Review Board.)

Publications based on Roper Center data collections should acknowledge the Roper Center and the organization(s) that originally sponsored and collected the data. Click here for more information on how to cite our data.

iPOLL search results are sorted by the most recent “Beginning Field Date” therefore on occasion you may see something seemingly out of order.

No. Anyone who is interested in public opinion polls can use our services. A cost estimate will be provided for any request that involves use of staff time. Pricing information is available online for datasets and Roper Center publications at Fees.

You can call Customer Services at (860)486-4440, or visit the List of Members page within this site. If your organization is not listed there, it does not have a membership at this time.  Consider recommending a trial membership to your library by visiting, Recommend to Library.

We encourage departments to pool their resources for membership. Frequently, the library of a college or university will hold the membership and serve the entire institution.

RoperExpress is a data access tool for on-demand download of data. Faculty and students at Member institutions have Unlimited Access to those datasets in the Roper Center collection that are in ASCII or SPSS portable formats. Simply conduct a search for datasets and the studies accessible for immediate download in RoperExpress are marked with an icon: express_logo_sm .  If a study is not marked as RoperExpress, you can request that it be made available using the email link provided.

Member university faculty and students may access Roper Center resources while off campus by logging into the proxy server or Virtual Private Network (VPN) typically available through your university library.  If you have created a personalized account you can access all services directly from anywhere.

See if your university is currently a member of the Roper Center by visiting List of Members. If you are still unsure of your university’s status, email

The EZproxy configuration required for successfully accessing Roper Center services can be found at  If you have questions not covered by this information, please contact the Center at 860.486.4440 or by email at

It is likely you are looking at the last version of the feed your computer cached/saved. To get the latest information merely click your browser’s refresh button (or using the browser menu, select “view” and “refresh”).

iPOLL Plus includes not only how the full sample responded to the question, but also some standard demographic groups replied.  The groups likely to be included are men, women, those who identify themselves as Republicans, Democrats or independents, and those of different regions, ages, incomes, or educational backgrounds.

There are a couple of explanations for this:

  1. The iPOLL Plus feature is the latest enhancement to iPOLL, and therefore the 100,000 questions available in this format are from surveys archived with the Center over the last fifteen years. Staff are working back in time to earlier datasets and continuing to process the most current studies in this form.
  2. In order to provide the group data, the Center has to have archived the dataset file, about 35% of the questions in iPOLL are from surveys that are not archived at the Roper Center.

The period covered by iPOLL Plus is approximately 1995-present, and represents about 1/6th of all of the questions in iPOLL, or just over 100,000 items.

When a table has a column of that is empty, this indicates that there were fewer than 100 respondents in that particular group and the Center has suppressed those results. Small samples, including subgroups of less than 100 people, increase the margin of sampling error significantly.  Suppressing these small sample groups prevents the user from inadvertently drawing conclusions that overstate the findings.

Survey organizations attempt to draw random samples—that is where every individual in the population has an equal chance of being a participant. For various reasons samples will over represent or under represent certain groups in the populations. As a result, survey firms will adjust the sample by a process called weighting.  Every survey will have a weighing variable and in order to have a representative sample, any analysis must include this weight.