UPDATED Mar. 13, 2023, at 3:53 PM

FiveThirtyEight’s Pollster Ratings

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

B/C

Montana State University Billings Mountain States Poll

Polls analyzed	11
Races called correctly	59%
Most recent cycle	2020
Affiliated with AAPOR/Roper	No
Other names

What are pollster ratings?

How accurate are the polls from Montana State University Billings Mountain States Poll?

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
Oct 19-24	546LV	House (MT-1) General election	Live Phone	Poll Rosendale +1.0	Actual Rosendale +12.8	Difference 11.8
Oct 19-24	546LV	Governor (MT) General election	Live Phone	Poll Even	Actual Gianforte +12.9	Difference 12.9
Oct 19-24	546LV	Senate (MT) General election	Live Phone	Poll Bullock +1.0	Actual Daines +10.0	Difference 11.0
Oct 19-24	546LV	President (MT) General election	Live Phone	Poll Trump +7.0	Actual Trump +16.4	Difference 9.4

2008

Dates	Sample	Race	Methodology	Poll margin	Election margin	Difference
Oct 16-20	403LV	House (MT-1) General election	Live Phone	Poll Rehberg +33.9	Actual Rehberg +31.7	Difference 2.2
Oct 16-20	403LV	President (MT) General election	Live Phone	Poll Obama +4.0	Actual McCain +2.3	Difference 6.3
Oct 16-20	403LV	Governor (MT) General election	Live Phone	Poll Schweitzer +32.9	Actual Schweitzer +33.0	Difference 0.1

2000

Dates	Sample	Race	Methodology	Poll margin	Election margin	Difference
Oct 19-23	403LV	House (MT-1) General election	Live Phone	Poll Rehberg +2.0	Actual Rehberg +5.2	Difference 3.2
Oct 19-23	403LV	Senate (MT) General election	Live Phone	Poll Schweitzer +2.0	Actual Burns +3.3	Difference 5.3
Oct 19-23	403LV	Governor (MT) General election	Live Phone	Poll O'Keefe +3.0	Actual Martz +3.9	Difference 6.9
Oct 19-23	403LV	President (MT) General election	Live Phone	Poll Bush +24.0	Actual Bush +25.1	Difference 1.1
Oct 19-23	403LV	President (MT) General election	Live Phone	Poll Bush +18.0	Actual Bush +25.1	Difference 7.1

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 about our methodology»

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, Cooper Burton and Dhrumil Mehta. Copy editing by Andrew Mangan. Visual editing by Christopher Groskopf. Statistical model by Nate Silver.

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