Learn about the 2018 methodology updates to the Gallup-Sharecare Well-Being Index and Gallup U.S. Poll.

What was the Gallup Daily tracking survey?

The Gallup Daily tracking survey, which began in 2008, was an unprecedented survey of approximately 1,000 U.S. adults each day, 350 days per year. Gallup Daily tracking consisted of two parallel surveys: the U.S. Daily and the Gallup-Sharecare Well-Being Index. For each of the two surveys, large sample sizes -- 3,500 after a week, 15,000 after a month, and 175,000 after a year -- allowed Gallup to examine extensive demographic breaks and cross-tabulations of the daily measures.

Gallup routinely incorporated additional questions into the Gallup Daily tracking survey on a short-term basis. These extra questions covered topical issues, including Americans' election voting intentions and opinions on worldwide news.

How were interviews conducted for the Gallup Daily tracking survey?

Gallup interviewed U.S. adults aged 18 and older living in all 50 states and the District of Columbia using a dual-frame design, which included both landline and cellphone numbers. Gallup sampled landline and cellphone numbers using random-digit-dial methods. Gallup purchased samples for this study from Survey Sampling International (SSI). Gallup chose landline respondents at random within each household based on which member had the next birthday. Each sample of national adults included a minimum quota of 70% cellphone respondents and 30% landline respondents, with additional minimum quotas by time zone within region. Gallup conducted interviews in Spanish for respondents who are primarily Spanish-speaking.

How many people were interviewed as part of the Gallup Daily tracking survey?

Gallup interviewed approximately 1,000 U.S. adults aged 18 and older every day. Of the 1,000 adults, Gallup interviewed approximately 500 respondents through the U.S. Daily survey and approximately 500 respondents through the Gallup-Sharecare Well-Being Index survey.

How often were the Gallup Daily tracking survey interviews conducted?

Since Gallup Daily tracking began in 2008, Gallup conducted interviews every day, excluding major holidays and other events, for 350 days per year.

Were the Gallup Daily tracking samples weighted?

Yes, Gallup weighted samples to correct for unequal selection probability, nonresponse, and double coverage of landline and cellphone users in the two sampling frames. Gallup also weighted its final samples to match the U.S. population according to gender, age, race, Hispanic ethnicity, education, region, population density, and phone status (cellphone only, landline only, both, and cellphone mostly). Demographic weighting targets for the U.S. and states were based on the most recent Current Population Survey figures for the aged 18 and older U.S. population, while weighting targets for metropolitan areas and congressional districts were based on Nielsen Claritas statistics. Phone status targets were based on the most recent National Health Interview Survey. Population density targets were based on the most recent U.S. Census. All reported margins of sampling error include computed design effects for weighting.

Where can I find results from Gallup Daily tracking and learn more about the survey?

Gallup reported findings in three-day rolling averages; weekly, monthly, quarterly, and yearly aggregates; and by region and state, as appropriate on Gallup.com. Sign up for Gallup News alerts to get articles as soon as they are published.

Gallup also reported Gallup Daily tracking results in interactive features such as:

For questions about how this survey was conducted, please contact galluphelp@gallup.com.

To get full trends for U.S. economic, well-being, and political data collected through Gallup Daily tracking since 2008, subscribe to Gallup Analytics.

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