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PUBLISHED Mar. 25, 2021, at 10:00 AM

FiveThirtyEight’s Pollster Ratings

Based on the historical accuracy and methodology of each polling organization’s polls.

Read more Download the data See the latest polls

ROI Rocket

Pollsters with a relatively small number of polls now receive a provisional rating rather than a precise letter grade.

B/C

Polls analyzed	3
Races called correctly	100%
Most recent cycle	2020
Affiliated with professional polling organization (NCPP/AAPOR/Roper)	No

How accurate are the polls from ROI Rocket?

Polls conducted within 21 days of an election (based on the poll’s median date) are used to determine the pollster’s grade.

2020

Key

A = Adults

RV = Registered voters

V = Voters

LV = Likely voters

Dates	Sample	Race	Methodology	Poll margin	Election margin	Difference
Mar 6-12	960LV	President (IL) Democratic primary	Online	Poll Biden (D) +23.0	Actual Biden (D) +22.7	Difference 0.3
Mar 6-12	877LV	President (FL) Democratic primary	Online	Poll Biden (D) +40.0	Actual Biden (D) +39.1	Difference 0.9
Mar 4-8	1,000LV	President (MI) Democratic primary	Online	Poll Biden (D) +10.0	Actual Biden (D) +16.6	Difference 6.6

How this works: FiveThirtyEight’s pollster ratings are calculated by analyzing the historical accuracy of each polling organization’s polls along with its methodology. Accuracy scores are adjusted for the type of election polled, the poll’s sample size, the performance of other polls surveying the same race and other factors. We also calculate measures of statistical bias in the polls. When a pollster publishes multiple versions of the same survey (for example, versions with and without third-party candidates included), FiveThirtyEight uses an average of the different versions to calculate the pollster’s rating. However, all versions of these polls are listed here. Read more »

Download this data as an Excel spreadsheet or get it on GitHub.

Design and development by Elena Mejía and Aaron Bycoffe. Research by Mary Radcliffe and Dhrumil Mehta. Statistical model by Nate Silver.

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