© 2018 Ipsos 1
Core Political Data
08.01.2018
Ipsos Poll Conducted for Reuters
© 2018 Ipsos. All rights reserved. Contains Ipsos' Confidential and Proprietary information and may not be
disclosed or reproduced without the prior written consent of Ipsos.
© 2018 Ipsos 2
These are findings from an Ipsos poll conducted
for date
July 27-July 31, 2018
For the survey,
a sample of
1,901
Americans
including
684
Democrats
18+
ages
w e r e i n t e r v i e w e d o n l i n e
Core Political Data
IPSOS POLL CONDUCTED FOR REUTERS
616
Republicans
198
Independents
1,571
Registered voters
© 2018 Ipsos 3
The precision of the Reuters/Ipsos online polls is measured using a credibility interval.
In this case, the poll has a credibility interval of plus or minus the following percentage points
For more information about credibility intervals, please see the appendix.
Core Political Data
IPSOS POLL CONDUCTED FOR REUTERS
2.6
All Adults
4.3
Democrats
4.5
Republicans
7.9
Independents
2.8
Registered
voters
© 2018 Ipsos 4
• The data were weighted to the U.S. current population data by:
– Gender
– Age
– Education
– Ethnicity
– Region
• Statistical margins of error are not applicable to online nonprobability polls.
• All sample surveys and polls may be subject to other sources of error, including, but not limited to
coverage error and measurement error.
• Figures marked by an asterisk (*) indicate a percentage value of greater than zero but less than
one half of one per cent.
• Where figures do not sum to 100, this is due to the effects of rounding.
• To see more information on this and other Reuters/Ipsos polls, please visit:
http://polling.reuters.com/
Core Political Data
IPSOS POLL CONDUCTED FOR REUTERS
© 2018 Ipsos 5
Right Direction/Wrong Track
Right Direction
Wrong Track
Don’t Know
All Adults
Generally speaking, would you say things in this country are heading in the
right direction, or are they off on the wrong track?
33%
55%
12%
37%
54%
9%
All
Registered
Voters
11%
83%
6%
71%
22%
7%
31%
55%
14%
Registered Voters:
Democrats
Registered Voters:
Republicans
RegisteredVoters:
Independents
© 2018 Ipsos 6
Main Problem Facing America
All Adults Registered Voters
Registered Voters:
Democrat
Registered Voters:
Republican
Registered Voters:
Independent
Economy generally 11% 12% 15% 10% 8%
Unemployment / lack of jobs 6% 4% 4% 2% 9%
War / foreign conflicts 4% 4% 6% 1% 3%
Immigration 15% 16% 8% 26% 16%
Terrorism / terrorist attacks 7% 8% 6% 11% 8%
Healthcare 18% 19% 23% 14% 17%
Energy issues 0% 0% 1% 0% 0%
Morality 9% 9% 7% 12% 8%
Education 5% 5% 6% 4% 8%
Crime 6% 6% 6% 7% 3%
Environment 5% 5% 6% 3% 4%
Don’t know 4% 2% 2% 1% 4%
Other 10% 10% 12% 7% 12%
In your opinion, what is the most important problem facing the US today?
© 2018 Ipsos 7
Main Problem Facing America
ALL ADULT AMERICANS
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
Economy Generally
Unemployment / jobs
Healthcare
Terrorism
Immigration
2012 2013 2014 2015 2016 2017 2018
© 2018 Ipsos 8
Overall, do you approve or disapprove about the way Donald Trump
is handling his job as President?
Is that strongly (approve/disapprove) or somewhat (approve/disapprove)? (Asked of those who selected “approve” or “disapprove”)
Q2b. If you had to choose, do you lean more towards approve or disapprove? (Asked of those who selected “don’t know”)
All Adults
All Registered
Voters
Registered Voters:
Democrat
Registered Voters:
Republican
Registered Voters:
Independent
Strongly approve 20% 23% 5% 47% 16%
Somewhat approve 17% 18% 5% 33% 19%
Lean towards approve 3% 3% 2% 4% 4%
Lean towards disapprove 2% 2% 1% 2% 5%
Somewhat disapprove 12% 11% 13% 7% 14%
Strongly disapprove 42% 41% 73% 6% 35%
Not sure 5% 3% 1% 1% 6%
TOTAL APPROVE 40% 44% 12% 83% 39%
TOTAL DISAPPROVE 55% 54% 86% 15% 54%
DONALD TRUMP
© 2018 Ipsos 9
0%
10%
20%
30%
40%
50%
60%
70%
JAN20-24,2017
FEB3-7,2017
FEB17-21,2017
MARCH3-7,2017
MARCH17-21,2017
MARCH31-APRIL4,2017
APRIL21-25,2017
MAY5-9,2017
MAY19-23,2017
JUNE2-6,2017
JUNE16-20,2017
JUNE30-JULY4,2017
JULY14-18,2017
JULY28-AUG1,2017
AUG11-15,2017
AUG25-29,2017
SEPT8-12,2017
SEPT22-26,2017
OCT6-10,2017
OCT20-24,2017
NOV3-7,2017
NOV17-21,2017
DEC1-5,2017
DEC15-19,2017
DEC29,2017-JAN2,2018
JAN12-16,2018
JAN26-30,2018
FEB9-13,2018
MARCH2-6,2018
MARCH16-20,2018
MARCH30-APRIL3,2018
APRIL13-17,2018
APRIL27-MAY1
MAY11-15,2018
MAY25-29,2018
JUNE8-12,2018
JUNE22-26,2018
JULY6-10,2018
JULY20-24,2018
40%
55%
Weekly Approval
ALL ADULT AMERICANS
© 2018 Ipsos 10
Reuters/Ipsos poll conducted 1/1/2018 to 6/30/2018 among 67,055; arrows represent changes of plus or minus 3 percentage points from 12/1/2017 thru 05/31/2018 based on change
in color bracket. Color scale represents degree of Trump approval, with each color corresponding to varying degrees of job approval from over 50% approval to under 30% approval
Overall, do you approve or disapprove about the way Donald Trump is handling his job as President?
ALL ADULT AMERICANS
Approval by State (January 2018 – June 2018)
Drop in approval
Increase in approval
No change
© 2018 Ipsos 11
Do you approve or disapprove about the way Donald Trump is handling the following
issues?
Strongly
approve
Somewhat
approve
Lean
towards
approve
Lean
towards
disapprove
Somewhat
disapprove
Strongly
disapprove
Don’t
know
TOTAL
APPROVE
TOTAL
DISAPPROVE
The US economy 23% 12% 12% 8% 8% 27% 9% 47% 44%
US foreign policy 18% 11% 10% 8% 8% 35% 10% 40% 51%
Healthcare reform 15% 11% 12% 9% 8% 34% 10% 38% 52%
Employment and jobs 24% 12% 14% 7% 8% 24% 10% 50% 40%
Dealing with
Congress
15% 11% 12% 10% 10% 32% 10% 38% 52%
Dealing with ISIS /
ISIL
22% 11% 12% 9% 7% 27% 12% 45% 42%
International trade 18% 11% 9% 8% 7% 35% 11% 38% 51%
Taxation 18% 12% 11% 8% 10% 30% 11% 41% 48%
Corruption 15% 10% 11% 8% 7% 37% 11% 36% 52%
The environment 12% 11% 12% 9% 7% 36% 12% 35% 53%
Immigration 23% 10% 8% 6% 6% 39% 7% 42% 51%
The way he treats
people like me
15% 9% 12% 7% 7% 40% 9% 37% 54%
The effort he is
making to unify the
country
17% 11% 10% 8% 7% 38% 9% 38% 53%
Russia 14% 10% 11% 9% 8% 38% 10% 35% 55%
Approval Attributes
ALL ADULT AMERICANS
© 2018 Ipsos 12
Of the following White House or Executive Branch staff members, who do you believe will be the
next to resign or be terminated? Will it be...
White House Exits
ALL ADULT AMERICANS
Yes
Jeff Sessions, Attorney General 14%
Sarah Sanders, Press Secretary 10%
John F. Kelly, Chief of Staff 9%
Betsy DeVos, Secretary of Education 8%
Jared Kushner, Senior Adviser to the President 8%
Mike Pompeo, Secretary of State 6%
Kellyanne Conway, Senior Counselor 5%
Kirstjen Nielsen, Secretary of Homeland Security 4%
Mike Pence, Vice President 4%
James Mattis, Secretary of Defense 3%
Steve Mnuchin, Treasury Secretary 3%
John R. Bolton, National Security Advisor 3%
Stephen Miller, Senior Advisor for Policy 3%
Nikki Haley, U.N. Ambassador 2%
Bill Shine, White House Communications Director 2%
Robert Lighthizer, Trade Representative 2%
Wilbur Ross, Secretary of Commerce 2%
Sonny Perdue, Agriculture Secretary 2%
© 2018 Ipsos 13
Overall, do you approve or disapprove about the way your Congressperson is handling their job as
Representative?
Congressional Approval
Split Sampled
All Adults Registered Voters
Registered Voters:
Democrat
Registered Voters:
Republican
Registered Voters:
Independent
Strongly approve 12% 14% 16% 15% 4%
Somewhat approve 32% 36% 33% 45% 24%
Somewhat disapprove 19% 20% 18% 17% 35%
Strongly disapprove 15% 15% 19% 12% 15%
Don’t know 22% 15% 14% 10% 22%
TOTAL APPROVE 44% 50% 49% 60% 28%
TOTAL DISAPPROVE 34% 35% 37% 29% 50%
Overall, do you approve or disapprove about the way Congress as a whole is handling its job?
All Adults Registered Voters
Registered Voters:
Democrat
Registered Voters:
Republican
Registered Voters:
Independent
Strongly approve 3% 3% 1% 6% 1%
Somewhat approve 16% 17% 11% 27% 14%
Somewhat disapprove 36% 38% 36% 38% 39%
Strongly disapprove 32% 34% 47% 21% 32%
Don’t know 14% 8% 5% 8% 13%
TOTAL APPROVE 19% 20% 12% 33% 16%
TOTAL DISAPPROVE 68% 72% 83% 58% 71%
© 2018 Ipsos 14
Thinking about the elections in 2018, if the election for U.S. Congress were held today,
would you vote for the Democratic candidate or the Republican candidate in your district
where you live?
All Adults Registered Voters
Registered Voters:
Democrat
Registered Voters:
Republican
Registered Voters:
Independent
Democratic candidate 37% 42% 85% 4% 20%
Republican candidate 30% 36% 3% 81% 19%
Candidate from another
political party
4% 4% 2% 2% 17%
Will not/do not plan to vote 14% 4% 3% 3% 9%
Don’t know / Refused 15% 14% 7% 10% 35%
2018 Generic Congressional Ballot Question
© 2018 Ipsos 15
All Adults
Registered Voters
Registered Voters:
Democrats
Registered Voters:
Republicans
Registered Voters:
Independents
2018 Generic Congressional Ballot Question
Thinking about the elections in 2018, if the election for U.S. Congress were held today,
would you vote for the Democratic candidate or the Republican candidate in your district
where you live?
June
2017
September
2017
January
2018
June
2018
37%
42%
85%
4%
20%
36%
30%
3%
81%
19%
Democrat Vote Share Republican Vote Share
© 2018 Ipsos 16
Political Identity
14%
20%
7%
7%
16%
11%
13%
7%
5%
34%
28%
41%
34%
13%
12%
Strong Democrat
Moderate Democrat
Lean Democrat
Lean Republican
Moderate Republican
Strong Republican
Independent
None of these
DK
Democrat
Republican
Democrat
Republican
Independent
None/DK
ALL ADULT AMERICANS
Party ID
Party ID w/ Lean
All Adults: n= 1,901
© 2018 Ipsos 17
How to Calculate Bayesian Credibility Intervals
APPENDIX
The calculation of credibility intervals assumes that Y has a binomial distribution conditioned on the
parameter θ, i.E., Y|θ~bin(n,θ), where n is the size of our sample. In this setting, Y counts the number
of “yes”, or “1”, observed in the sample, so that the sample mean (y ̅) is a natural estimate of the true
population proportion θ. This model is often called the likelihood function, and it is a standard concept
in both the Bayesian and the classical framework. The Bayesian1 statistics combines both the prior
distribution and the likelihood function to create a posterior distribution.
The posterior distribution represents our opinion about which are the plausible values for θ adjusted
after observing the sample data. In reality, the posterior distribution is one’s knowledge base updated
using the latest survey information. For the prior and likelihood functions specified here, the posterior
distribution is also a beta distribution (π(θ/y)~β(y+a,n-y+b)), but with updated hyper-parameters.
Our credibility interval for θ is based on this posterior distribution. As mentioned above, these intervals
represent our belief about which are the most plausible values for θ given our updated knowledge base.
There are different ways to calculate these intervals based on π(θ/y). Since we want only one measure
of precision for all variables in the survey, analogous to what is done within the classical framework, we
will compute the largest possible credibility interval for any observed sample. The worst case occurs
when we assume that a=1 and b=1 and y=n/2. Using a simple approximation of the posterior by the
normal distribution, the 95% credibility interval is given by, approximately:
© 2018 Ipsos 18
FOR THIS POLL
The Bayesian credibility interval was adjusted using standard weighting design effect 1+L=1.3 to
account for complex weighting2
Examples of credibility intervals for different base sizes are below:
How to Calculate Bayesian Credibility Intervals
APPENDIX
SAMPLE SIZE
CREDIBILITY
INTERVALS
2,000 2.5
1,500 2.9
1,000 3.5
750 4.1
500 5.0
350 6.0
200 7.9
100 11.2
1 Bayesian Data Analysis, Second Edition, Andrew Gelman, John B. Carlin, Hal S. Stern, Donald B. Rubin, Chapman & Hall/CRC | ISBN: 158488388X | 2003
2 Kish, L. (1992). Weighting for unequal Pi . Journal of Official, Statistics, 8, 2, 183200.
Ipsos does not publish data
for base sizes
(sample sizes) below 100.
© 2018 Ipsos 19
ABOUT IPSOS
Ipsos ranks third in the global research industry.
With a strong presence in 89 countries, Ipsos
employs more than 16,000 people and has the
ability to conduct research programs in more
than 100 countries. Founded in France in 1975,
Ipsos is controlled and managed by research
professionals. They have built a solid Group
around a multi-specialist positioning – Media
and advertising research; Marketing research;
Client and employee relationship management;
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Ipsos is listed on Eurolist – NYSE – Euronext.
The company is part of the SBF 120 and the
Mid-60 index and is eligible for the Deferred
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ISIN code FR0000073298, Reuters ISOS.PA,
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www.ipsos.com
GAME CHANGERS
At Ipsos we are passionately curious about people, markets,
brands, and society. We deliver information and analysis
that makes our complex world easier and faster to navigate
and inspires our clients to make smarter decisions.
We believe that our work is important. Security, simplicity,
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and desire to influence and shape the future.
“GAME CHANGERS” – our tagline – summarizes our ambition.

Reuters/Ipsos Data: Core Political (08/01/2018)

  • 1.
    © 2018 Ipsos1 Core Political Data 08.01.2018 Ipsos Poll Conducted for Reuters © 2018 Ipsos. All rights reserved. Contains Ipsos' Confidential and Proprietary information and may not be disclosed or reproduced without the prior written consent of Ipsos.
  • 2.
    © 2018 Ipsos2 These are findings from an Ipsos poll conducted for date July 27-July 31, 2018 For the survey, a sample of 1,901 Americans including 684 Democrats 18+ ages w e r e i n t e r v i e w e d o n l i n e Core Political Data IPSOS POLL CONDUCTED FOR REUTERS 616 Republicans 198 Independents 1,571 Registered voters
  • 3.
    © 2018 Ipsos3 The precision of the Reuters/Ipsos online polls is measured using a credibility interval. In this case, the poll has a credibility interval of plus or minus the following percentage points For more information about credibility intervals, please see the appendix. Core Political Data IPSOS POLL CONDUCTED FOR REUTERS 2.6 All Adults 4.3 Democrats 4.5 Republicans 7.9 Independents 2.8 Registered voters
  • 4.
    © 2018 Ipsos4 • The data were weighted to the U.S. current population data by: – Gender – Age – Education – Ethnicity – Region • Statistical margins of error are not applicable to online nonprobability polls. • All sample surveys and polls may be subject to other sources of error, including, but not limited to coverage error and measurement error. • Figures marked by an asterisk (*) indicate a percentage value of greater than zero but less than one half of one per cent. • Where figures do not sum to 100, this is due to the effects of rounding. • To see more information on this and other Reuters/Ipsos polls, please visit: http://polling.reuters.com/ Core Political Data IPSOS POLL CONDUCTED FOR REUTERS
  • 5.
    © 2018 Ipsos5 Right Direction/Wrong Track Right Direction Wrong Track Don’t Know All Adults Generally speaking, would you say things in this country are heading in the right direction, or are they off on the wrong track? 33% 55% 12% 37% 54% 9% All Registered Voters 11% 83% 6% 71% 22% 7% 31% 55% 14% Registered Voters: Democrats Registered Voters: Republicans RegisteredVoters: Independents
  • 6.
    © 2018 Ipsos6 Main Problem Facing America All Adults Registered Voters Registered Voters: Democrat Registered Voters: Republican Registered Voters: Independent Economy generally 11% 12% 15% 10% 8% Unemployment / lack of jobs 6% 4% 4% 2% 9% War / foreign conflicts 4% 4% 6% 1% 3% Immigration 15% 16% 8% 26% 16% Terrorism / terrorist attacks 7% 8% 6% 11% 8% Healthcare 18% 19% 23% 14% 17% Energy issues 0% 0% 1% 0% 0% Morality 9% 9% 7% 12% 8% Education 5% 5% 6% 4% 8% Crime 6% 6% 6% 7% 3% Environment 5% 5% 6% 3% 4% Don’t know 4% 2% 2% 1% 4% Other 10% 10% 12% 7% 12% In your opinion, what is the most important problem facing the US today?
  • 7.
    © 2018 Ipsos7 Main Problem Facing America ALL ADULT AMERICANS 0% 5% 10% 15% 20% 25% 30% 35% 40% 45% Economy Generally Unemployment / jobs Healthcare Terrorism Immigration 2012 2013 2014 2015 2016 2017 2018
  • 8.
    © 2018 Ipsos8 Overall, do you approve or disapprove about the way Donald Trump is handling his job as President? Is that strongly (approve/disapprove) or somewhat (approve/disapprove)? (Asked of those who selected “approve” or “disapprove”) Q2b. If you had to choose, do you lean more towards approve or disapprove? (Asked of those who selected “don’t know”) All Adults All Registered Voters Registered Voters: Democrat Registered Voters: Republican Registered Voters: Independent Strongly approve 20% 23% 5% 47% 16% Somewhat approve 17% 18% 5% 33% 19% Lean towards approve 3% 3% 2% 4% 4% Lean towards disapprove 2% 2% 1% 2% 5% Somewhat disapprove 12% 11% 13% 7% 14% Strongly disapprove 42% 41% 73% 6% 35% Not sure 5% 3% 1% 1% 6% TOTAL APPROVE 40% 44% 12% 83% 39% TOTAL DISAPPROVE 55% 54% 86% 15% 54% DONALD TRUMP
  • 9.
    © 2018 Ipsos9 0% 10% 20% 30% 40% 50% 60% 70% JAN20-24,2017 FEB3-7,2017 FEB17-21,2017 MARCH3-7,2017 MARCH17-21,2017 MARCH31-APRIL4,2017 APRIL21-25,2017 MAY5-9,2017 MAY19-23,2017 JUNE2-6,2017 JUNE16-20,2017 JUNE30-JULY4,2017 JULY14-18,2017 JULY28-AUG1,2017 AUG11-15,2017 AUG25-29,2017 SEPT8-12,2017 SEPT22-26,2017 OCT6-10,2017 OCT20-24,2017 NOV3-7,2017 NOV17-21,2017 DEC1-5,2017 DEC15-19,2017 DEC29,2017-JAN2,2018 JAN12-16,2018 JAN26-30,2018 FEB9-13,2018 MARCH2-6,2018 MARCH16-20,2018 MARCH30-APRIL3,2018 APRIL13-17,2018 APRIL27-MAY1 MAY11-15,2018 MAY25-29,2018 JUNE8-12,2018 JUNE22-26,2018 JULY6-10,2018 JULY20-24,2018 40% 55% Weekly Approval ALL ADULT AMERICANS
  • 10.
    © 2018 Ipsos10 Reuters/Ipsos poll conducted 1/1/2018 to 6/30/2018 among 67,055; arrows represent changes of plus or minus 3 percentage points from 12/1/2017 thru 05/31/2018 based on change in color bracket. Color scale represents degree of Trump approval, with each color corresponding to varying degrees of job approval from over 50% approval to under 30% approval Overall, do you approve or disapprove about the way Donald Trump is handling his job as President? ALL ADULT AMERICANS Approval by State (January 2018 – June 2018) Drop in approval Increase in approval No change
  • 11.
    © 2018 Ipsos11 Do you approve or disapprove about the way Donald Trump is handling the following issues? Strongly approve Somewhat approve Lean towards approve Lean towards disapprove Somewhat disapprove Strongly disapprove Don’t know TOTAL APPROVE TOTAL DISAPPROVE The US economy 23% 12% 12% 8% 8% 27% 9% 47% 44% US foreign policy 18% 11% 10% 8% 8% 35% 10% 40% 51% Healthcare reform 15% 11% 12% 9% 8% 34% 10% 38% 52% Employment and jobs 24% 12% 14% 7% 8% 24% 10% 50% 40% Dealing with Congress 15% 11% 12% 10% 10% 32% 10% 38% 52% Dealing with ISIS / ISIL 22% 11% 12% 9% 7% 27% 12% 45% 42% International trade 18% 11% 9% 8% 7% 35% 11% 38% 51% Taxation 18% 12% 11% 8% 10% 30% 11% 41% 48% Corruption 15% 10% 11% 8% 7% 37% 11% 36% 52% The environment 12% 11% 12% 9% 7% 36% 12% 35% 53% Immigration 23% 10% 8% 6% 6% 39% 7% 42% 51% The way he treats people like me 15% 9% 12% 7% 7% 40% 9% 37% 54% The effort he is making to unify the country 17% 11% 10% 8% 7% 38% 9% 38% 53% Russia 14% 10% 11% 9% 8% 38% 10% 35% 55% Approval Attributes ALL ADULT AMERICANS
  • 12.
    © 2018 Ipsos12 Of the following White House or Executive Branch staff members, who do you believe will be the next to resign or be terminated? Will it be... White House Exits ALL ADULT AMERICANS Yes Jeff Sessions, Attorney General 14% Sarah Sanders, Press Secretary 10% John F. Kelly, Chief of Staff 9% Betsy DeVos, Secretary of Education 8% Jared Kushner, Senior Adviser to the President 8% Mike Pompeo, Secretary of State 6% Kellyanne Conway, Senior Counselor 5% Kirstjen Nielsen, Secretary of Homeland Security 4% Mike Pence, Vice President 4% James Mattis, Secretary of Defense 3% Steve Mnuchin, Treasury Secretary 3% John R. Bolton, National Security Advisor 3% Stephen Miller, Senior Advisor for Policy 3% Nikki Haley, U.N. Ambassador 2% Bill Shine, White House Communications Director 2% Robert Lighthizer, Trade Representative 2% Wilbur Ross, Secretary of Commerce 2% Sonny Perdue, Agriculture Secretary 2%
  • 13.
    © 2018 Ipsos13 Overall, do you approve or disapprove about the way your Congressperson is handling their job as Representative? Congressional Approval Split Sampled All Adults Registered Voters Registered Voters: Democrat Registered Voters: Republican Registered Voters: Independent Strongly approve 12% 14% 16% 15% 4% Somewhat approve 32% 36% 33% 45% 24% Somewhat disapprove 19% 20% 18% 17% 35% Strongly disapprove 15% 15% 19% 12% 15% Don’t know 22% 15% 14% 10% 22% TOTAL APPROVE 44% 50% 49% 60% 28% TOTAL DISAPPROVE 34% 35% 37% 29% 50% Overall, do you approve or disapprove about the way Congress as a whole is handling its job? All Adults Registered Voters Registered Voters: Democrat Registered Voters: Republican Registered Voters: Independent Strongly approve 3% 3% 1% 6% 1% Somewhat approve 16% 17% 11% 27% 14% Somewhat disapprove 36% 38% 36% 38% 39% Strongly disapprove 32% 34% 47% 21% 32% Don’t know 14% 8% 5% 8% 13% TOTAL APPROVE 19% 20% 12% 33% 16% TOTAL DISAPPROVE 68% 72% 83% 58% 71%
  • 14.
    © 2018 Ipsos14 Thinking about the elections in 2018, if the election for U.S. Congress were held today, would you vote for the Democratic candidate or the Republican candidate in your district where you live? All Adults Registered Voters Registered Voters: Democrat Registered Voters: Republican Registered Voters: Independent Democratic candidate 37% 42% 85% 4% 20% Republican candidate 30% 36% 3% 81% 19% Candidate from another political party 4% 4% 2% 2% 17% Will not/do not plan to vote 14% 4% 3% 3% 9% Don’t know / Refused 15% 14% 7% 10% 35% 2018 Generic Congressional Ballot Question
  • 15.
    © 2018 Ipsos15 All Adults Registered Voters Registered Voters: Democrats Registered Voters: Republicans Registered Voters: Independents 2018 Generic Congressional Ballot Question Thinking about the elections in 2018, if the election for U.S. Congress were held today, would you vote for the Democratic candidate or the Republican candidate in your district where you live? June 2017 September 2017 January 2018 June 2018 37% 42% 85% 4% 20% 36% 30% 3% 81% 19% Democrat Vote Share Republican Vote Share
  • 16.
    © 2018 Ipsos16 Political Identity 14% 20% 7% 7% 16% 11% 13% 7% 5% 34% 28% 41% 34% 13% 12% Strong Democrat Moderate Democrat Lean Democrat Lean Republican Moderate Republican Strong Republican Independent None of these DK Democrat Republican Democrat Republican Independent None/DK ALL ADULT AMERICANS Party ID Party ID w/ Lean All Adults: n= 1,901
  • 17.
    © 2018 Ipsos17 How to Calculate Bayesian Credibility Intervals APPENDIX The calculation of credibility intervals assumes that Y has a binomial distribution conditioned on the parameter θ, i.E., Y|θ~bin(n,θ), where n is the size of our sample. In this setting, Y counts the number of “yes”, or “1”, observed in the sample, so that the sample mean (y ̅) is a natural estimate of the true population proportion θ. This model is often called the likelihood function, and it is a standard concept in both the Bayesian and the classical framework. The Bayesian1 statistics combines both the prior distribution and the likelihood function to create a posterior distribution. The posterior distribution represents our opinion about which are the plausible values for θ adjusted after observing the sample data. In reality, the posterior distribution is one’s knowledge base updated using the latest survey information. For the prior and likelihood functions specified here, the posterior distribution is also a beta distribution (π(θ/y)~β(y+a,n-y+b)), but with updated hyper-parameters. Our credibility interval for θ is based on this posterior distribution. As mentioned above, these intervals represent our belief about which are the most plausible values for θ given our updated knowledge base. There are different ways to calculate these intervals based on π(θ/y). Since we want only one measure of precision for all variables in the survey, analogous to what is done within the classical framework, we will compute the largest possible credibility interval for any observed sample. The worst case occurs when we assume that a=1 and b=1 and y=n/2. Using a simple approximation of the posterior by the normal distribution, the 95% credibility interval is given by, approximately:
  • 18.
    © 2018 Ipsos18 FOR THIS POLL The Bayesian credibility interval was adjusted using standard weighting design effect 1+L=1.3 to account for complex weighting2 Examples of credibility intervals for different base sizes are below: How to Calculate Bayesian Credibility Intervals APPENDIX SAMPLE SIZE CREDIBILITY INTERVALS 2,000 2.5 1,500 2.9 1,000 3.5 750 4.1 500 5.0 350 6.0 200 7.9 100 11.2 1 Bayesian Data Analysis, Second Edition, Andrew Gelman, John B. Carlin, Hal S. Stern, Donald B. Rubin, Chapman & Hall/CRC | ISBN: 158488388X | 2003 2 Kish, L. (1992). Weighting for unequal Pi . Journal of Official, Statistics, 8, 2, 183200. Ipsos does not publish data for base sizes (sample sizes) below 100.
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    © 2018 Ipsos19 ABOUT IPSOS Ipsos ranks third in the global research industry. With a strong presence in 89 countries, Ipsos employs more than 16,000 people and has the ability to conduct research programs in more than 100 countries. Founded in France in 1975, Ipsos is controlled and managed by research professionals. They have built a solid Group around a multi-specialist positioning – Media and advertising research; Marketing research; Client and employee relationship management; Opinion & social research; Mobile, Online, Offline data collection and delivery. Ipsos is listed on Eurolist – NYSE – Euronext. The company is part of the SBF 120 and the Mid-60 index and is eligible for the Deferred Settlement Service (SRD). ISIN code FR0000073298, Reuters ISOS.PA, Bloomberg IPS:FP www.ipsos.com GAME CHANGERS At Ipsos we are passionately curious about people, markets, brands, and society. We deliver information and analysis that makes our complex world easier and faster to navigate and inspires our clients to make smarter decisions. We believe that our work is important. Security, simplicity, speed, and substance applies to everything we do. Through specialization, we offer our clients a unique depth of knowledge and expertise. Learning from different experiences gives us perspective and inspires us to boldly call things into question, to be creative. By nurturing a culture of collaboration and curiosity, we attract the highest caliber of people who have the ability and desire to influence and shape the future. “GAME CHANGERS” – our tagline – summarizes our ambition.