Understanding Survey Methodology: How Pew Research Center Conducts the American Trends Panel

The Pew Research Center maintains the American Trends Panel (ATP) as a nationally representative, probability-based online survey platform, utilizing address-based sampling to track public opinion across the United States. By recruiting households through the U.S. Postal Service and employing rigorous weighting procedures, the Center produces data designed to reflect the demographic composition of the U.S. adult population, according to official [methodology reports](https://www.pewresearch.org/methodology/surveys/american-trends-panel/).

How the American Trends Panel Selects Participants

The ATP utilizes address-based sampling (ABS) to ensure a random, representative selection of U.S. adults. Since 2018, the Center has mailed study invitations to households randomly selected from the [U.S. Postal Service’s Computerized Delivery Sequence File](https://www.usps.com/business/pdf/c-dsf-product-guide.pdf). This file captures the vast majority of residential addresses in the country. Once a household is selected, a specific adult—typically the one with the next upcoming birthday—is invited to join the panel to prevent self-selection bias. Before 2018, the Center relied on landline and cellphone random-digit-dialing methods.

Ensuring Data Accuracy Through Weighting and Oversampling

To capture the voices of smaller demographic groups, the Pew Research Center occasionally uses oversampling. This process intentionally recruits higher numbers of specific populations—such as Black Protestants, White evangelical Protestants, or Asian adults—who might otherwise be underrepresented in a purely random sample.

According to the Center’s [standard weighting procedures](https://www.pewresearch.org/methodology/methodology-reports/weighting-the-american-trends-panel/), these oversampled groups are statistically adjusted during data analysis. Researchers apply weights to ensure that the final results align with established population benchmarks from the U.S. Census Bureau. This calibration corrects for both nonresponse to recruitment efforts and panel attrition, ensuring that the final data set accurately mirrors the broader U.S. adult population.

Maintaining Quality Control in Data Collection

The Center employs multiple layers of quality assurance to maintain the integrity of its survey data. Before a survey goes live, the research team and [SSRS](https://ssrs.com/), the firm that manages the data collection, perform rigorous testing on both mobile and desktop platforms. This testing ensures that survey logic, randomization, and skip patterns function correctly.

Once data collection begins, the Center monitors for “satisficing”—a pattern where respondents provide low-effort answers, such as selecting the same response for every question or skipping items at high rates. Respondents who exhibit these patterns are removed from the final dataset before weighting occurs.

Key Differences Between ATP and Traditional Polling

The American Trends Panel differs from traditional “snapshot” polls in its longitudinal nature. While a standard poll might reach a new group of people for every study, the ATP engages a consistent, recruited panel over time.

| Feature | Traditional Random-Digit-Dialing | American Trends Panel (ATP) |
| :— | :— | :— |
| Recruitment | Random phone numbers | Address-based (Mail) |
| Duration | Single-use sample | Longitudinal (long-term) |
| Method | Telephone only | Mixed (Online and Phone) |
| Sample Base | General public | Recruited, vetted panelists |

This structure allows researchers to track how the same individuals’ opinions change over months or years, providing a deeper look at shifts in public sentiment than a one-time survey can offer. The Center’s commitment to transparency, including the publication of [disposition and response rates](https://www.pewresearch.org/methodology/about-the-american-trends-panel/) for every wave, serves as a standard for accountability in public opinion research.