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IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
Ipsos Poll Conducted for Airlines for America
These are findings from an Ipsos poll conducted December 14-22, 2015 on behalf of Airlines for America. For the survey, a sample of roughly 3,019 adults age 18+ from the continental U.S., Alaska and Hawaii was interviewed online in English. This sample also included 1,162 2015 airline travelers. The sample for this study was randomly drawn from Ipsos’s online panel (see link below for more info on “Access Panels and Recruitment”), partner online panel sources, and “river” sampling (see link below for more info on the Ipsos “Ampario Overview” sample method) and does not rely on a population frame in the traditional sense. Ipsos uses fixed sample targets, unique to each study, in drawing sample. After a sample has been obtained from the Ipsos panel, Ipsos calibrates respondent characteristics to be representative of the U.S. Population using standard procedures such as raking-ratio adjustments. The source of these population targets is U.S. Census 2015 American Community Survey data. The sample drawn for this study reflects fixed sample targets on demographics. Post-hoc weights were made to the population characteristics on gender, age, region, race/ethnicity and income. Statistical margins of error are not applicable to online polls. All sample surveys and polls may be subject to other sources of error, including, but not limited to coverage error and measurement error. Where figures do not sum to 100, this is due to the effects of rounding. The precision of Ipsos online polls is measured using a credibility interval. In this case, the poll has a credibility interval of plus or minus 2.0 percentage point for all respondents (see link below for more info on Ipsos online polling “Credibility Intervals”). Ipsos calculates a design effect (DEFF) for each study based on the variation of the weights, following the formula of Kish (1965). This study had a credibility interval adjusted for design effect of the following (n=3,019 DEFF=1.5, adjusted Confidence Interval=3.5). The poll also has a credibility interval plus or minus 3.3 percentage points for 2015 airline travelers. For more information about Ipsos online polling methodology, please go here http://goo.gl/yJBkuf
All Americans Flew Airlines in 2015
%/Mean %/Mean DCF1_1. [An airline] Have
you ever flown on the following?
No 19% 0%
Yes 81% 100%
DCF1_2. [A non-airline
aircraft for business purposes] Have you ever flown on the following?
No 92% 90%
Yes 8% 10%
DCF1_3. [A non-airline
aircraft for personal (e.g., family, recreation)
purposes] Have you ever flown on the following?
No 87% 85%
Yes 13% 15%
DCF1_4. [None of these]
Have you ever flown on the following?
No 84% 100%
Yes 16% 0%
DCF2_1. [An airline] Have
you ever flown on the No 46% 0% Yes 54% 100%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
following in 2015?
DCF2_2. [A non-airline
aircraft for business purposes] Have you ever flown on the following in
2015?
No 97% 97%
Yes 3% 3%
DCF2_3. [A non-airline
aircraft for personal (e.g., family, recreation)purposes] Have you ever flown on the
following in 2015?
No 97% 97%
Yes 3% 3%
DCF2_4. [None of these]
Have you ever flown on the following in 2015?
No 56% 100%
Yes 44% 0%
DCF3_1. [Primarily business
purposes] In 2015, how many trips did you take on
airlines for the following purposes? Count each
roundtrip as a single trip and include any trips
planned for the last few weeks of 2015.
1.48 1.48
DCF3_2. [Primarily personal leisure purposes] In 2015,
how many trips did you take on airlines for the following
purposes? Count each roundtrip as a single trip
and include any trips planned for the last few
weeks of 2015.
2.31 2.31
DCF3_3. [Primarily personal non-leisure purposes (e.g.,
traveling to school, attending family event, financial issues, medical matters)] In 2015, how
many trips did you take on airlines for the following purposes? Count each
roundtrip as a single trip and include any trips
planned for the last few weeks of 2015.
0.96 0.96
DCF4. How many of your ... total trips by airline in 2015
combined both business and personal purposes?
1.63 1.63
DCF5_2. [Canada] ...
business flights you took in 2015? Please specify the
number of air trips to each
0 77% 77%
1+ 23% 23%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
location.
DCF5_3. [Mexico] ...
business flights you took in 2015? Please specify the
number of air trips to each location.
0 85% 85%
1+ 15% 15%
DCF5_4. [The Caribbean] ... business flights you took in
2015? Please specify the number of air trips to each
location.
0 87% 87%
1 11% 11%
DCF5_5. [Central America] ... business flights you took in 2015? Please specify the number of air trips to each
location.
0 86% 86%
1+ 14% 14%
DCF5_6. [South America] ... business flights you took in
2015? Please specify the number of air trips to each
location.
0 89% 89%
1+ 11% 11%
DCF5_7. [Europe] ...
business flights you took in 2015? Please specify the
number of air trips to each location.
0 75% 75%
1+ 25% 25%
DCF5_8. [Africa] ... business
flights you took in 2015? Please specify the number
of air trips to each location.
0 94% 94%
1+ 6% 6%
DCF5_9. [Middle East] ...
business flights you took in 2015? Please specify the
number of air trips to each location.
0 93% 93%
1+ 7% 7%
DCF5_10. [Asia / Australia /
New Zealand / Guam] ... business flights you took in
2015? Please specify the number of air trips to each
location.
0 90% 90%
1+ 10% 10%
DCF6_1. [USA 50-State] ...
personal flights you took in 2015? Please specify the
number of air trips to each location.
0 14% 14%
1+ 86% 86%
DCF6_2. [Canada] ... 0 91% 91%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
personal flights you took in 2015? Please specify the
number of air trips to each location.
1+ 9% 9%
DCF6_3. [Mexico] ...
personal flights you took in 2015? Please specify the
number of air trips to each location.
0 90% 90%
1+ 10% 10%
DCF6_4. [The Caribbean] ... personal flights you took in
2015? Please specify the number of air trips to each
location.
0 89% 89%
1+ 11% 11%
DCF6_5. [Central America] ... personal flights you took in 2015? Please specify the number of air trips to each
location.
0 93% 93%
1+ 7% 7%
DCF6_6. [South America] ... personal flights you took in
2015? Please specify the number of air trips to each
location.
0 94% 94%
1+ 6% 6%
DCF6_7. [Europe] ...
personal flights you took in 2015? Please specify the
number of air trips to each location.
0 84% 84%
1+ 16% 16%
DCF6_8. [Africa] ... personal
flights you took in 2015? Please specify the number
of air trips to each location.
0 98% 98%
1+ 2% 2%
DCF6_9. [Middle East] ...
personal flights you took in 2015? Please specify the
number of air trips to each location.
0 97% 97% 1 2% 2% 2 1% 1%
3 0% 0%
DCF7_1. [Personal domestic
travel] On average, how many nights did you stay at your destination when you took the following types of
trips?
5.69 5.69
DCF7_2. [Personal international travel] On
average, how many nights did you stay at your
destination when you took
7.74 7.74
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
the following types of trips? DCF7_3. [Business domestic
travel] On average, how many nights did you stay at your destination when you took the following types of
trips?
4.00 4.00
DCF7_4. [Business international travel] On
average, how many nights did you stay at your
destination when you took the following types of trips?
3.69 3.69
DCF8. When you travel via airline on personal trips, how many people do you
usually travel with?
1.71 1.71
DCF9_1. [Personal domestic travel] When you take the
following types of trips, how many carry-on/personal
items do you usually take?
1.33 1.33
DCF9_2. [Personal international travel] When
you take the following types of trips, how many carry-on/personal items do you
usually take?
1.36 1.36
DCF9_3. [Business domestic travel] When you take the
following types of trips, how many carry-on/personal
items do you usually take?
1.22 1.22
DCF9_4. [Business international travel] When
you take the following types of trips, how many carry-on/personal items do you
usually take?
1.10 1.10
DCF10_1. [Personal domestic travel] When you take the following types of trips, how many pieces of
luggage do you usually check?
0.97 0.97
DCF10_2. [Personal international travel] When
you take the following types of trips, how many pieces of
luggage do you usually check?
1.30 1.30
DCF10_3. [Business domestic travel] When you take the following types of trips, how many pieces of
luggage do you usually check?
1.02 1.02
DCF10_4. [Business 1.30 1.30
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
international travel] When you take the following types of trips, how many pieces of
luggage do you usually check?
DCF11_1. [Personal
domestic travel] Of the ... pieces of luggage you
usually check, how many required payment?
0 47% 47% 1 43% 43% 2 8% 8% 3 1% 1% 4 0% 0%
DCF11_2. [Personal
international travel] Of the ... pieces of luggage you usually check, how many
required payment?
0 41% 41% 1 42% 42% 2 14% 14%
3 3% 3%
DCF11_3. [Business
domestic travel] Of the ... pieces of luggage you
usually check, how many required payment?
0 32% 32% 1 48% 48% 2 16% 16%
3 3% 3%
DCF11_4. [Business
international travel] Of the ... pieces of luggage you usually check, how many
required payment?
0 19% 19% 1 43% 43% 2 29% 29% 3 5% 5% 4 3% 3%
DCF12_1. [Personal
domestic travel] What type of ticket do you (or your
company) usually book for these kinds of flights?
First Class or Business Class
14% 14%
Premium Economy Class
14% 14%
Basic Economy Class 72% 72%
DCF12_2. [Personal
international travel] What type of ticket do you (or
your company) usually book for these kinds of flights?
First Class or Business Class
20% 20%
Premium Economy Class
36% 36%
Basic Economy Class 44% 44%
DCF12_3. [Business
domestic travel] What type of ticket do you (or your
company) usually book for these kinds of flights?
First Class or Business Class
23% 23%
Premium Economy Class
31% 31%
Basic Economy Class 46% 46%
DCF12_4. [Business
international travel] What type of ticket do you (or
your company) usually book for these kinds of flights?
First Class or Business Class
46% 46%
Premium Economy Class
35% 35%
Basic Economy Class 18% 18%
DCF13_1. [Personal
domestic travel] How far in advance of the trip do you
0-3 days 8% 8% 4-7 days 11% 11%
8-21 days 16% 16%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
usually book travel for these kinds of flights?
22 days to three months
44% 44%
More than three months
21% 21%
DCF13_2. [Personal international travel] How far
in advance of the trip do you usually book travel for
these kinds of flights?
0-3 days 8% 8% 4-7 days 17% 17%
8-21 days 16% 16% 22 days to three
months 30% 30%
More than three months
29% 29%
DCF13_3. [Business domestic travel] How far in advance of the trip do you
usually book travel for these kinds of flights?
0-3 days 14% 14% 4-7 days 21% 21%
8-21 days 34% 34% 22 days to three
months 23% 23%
More than three months
8% 8%
DCF13_4. [Business international travel] How far
in advance of the trip do you usually book travel for
these kinds of flights?
0-3 days 11% 11% 4-7 days 28% 28%
8-21 days 29% 29% 22 days to three
months 23% 23%
More than three months
9% 9%
DCF14_1. [Personal domestic travel] What
resource do you usually use to book travel for these
kinds of flights?
Airline website 58% 58% Online travel agency (e.g., Expedia, Orbitz, Priceline, Travelocity)
33% 33%
Traditional travel agency or corporate travel department
5% 5%
Airline reservation agent (either over the phone or in person)
4% 4%
DCF14_2. [Personal international travel] What
resource do you usually use to book travel for these
kinds of flights?
Airline website 34% 34% Online travel agency (e.g., Expedia, Orbitz, Priceline, Travelocity)
49% 49%
Traditional travel agency or corporate travel department
13% 13%
Airline reservation agent (either over the phone or in person)
5% 5%
DCF14_3. [Business domestic travel] What
resource do you usually use to book travel for these
kinds of flights?
Airline website 44% 44% Online travel agency (e.g., Expedia, Orbitz, Priceline, Travelocity)
25% 25%
Traditional travel agency or corporate travel department
28% 28%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
Airline reservation agent (either over the phone or in person)
3% 3%
DCF14_4. [Business international travel] What
resource do you usually use to book travel for these
kinds of flights?
Airline website 34% 34% Online travel agency (e.g., Expedia, Orbitz, Priceline, Travelocity)
34% 34%
Traditional travel agency or corporate travel department
20% 20%
Airline reservation agent (either over the phone or in person)
12% 12%
DCF15. How do you most commonly check in for
flights?
Mobile device/app 22% 22% Personal computer 50% 50% Automated kiosk at
the airport 17% 17%
Airport ticket counter 11% 11%
DCF16. In 2015, did you purchase a seat upgrade
using money, points or miles on any flight?
Yes 23% 23% No 75% 75%
Not sure 2% 2%
DCF17. Are you currently enrolled in any frequent
flyer program and do you have any status giving you extra privileges (like early
boarding, lounge access or free checked bags)?
No 61% 34% Yes, frequent flyer
program member, but do not have elite
status
33% 55%
Yes, have elite status with a frequent flyer
program 5% 10%
DCF18_1. [CBP Global Entry
(via U.S. Customs and Border Protection)] Are you currently enrolled in either of these expedited security
screening programs?
No 93% 87%
Yes 7% 13%
DCF18_2. [TSA Precheck (via U.S. Transportation Security
Administration)] Are you currently enrolled in either of these expedited security
screening programs?
No 90% 81%
Yes 10% 19%
DCF18_3. [No, I am not
enrolled in either of these] Are you currently enrolled
in either of these expedited security screening
programs?
No 14% 27%
Yes 86% 73%
DCF19_1. [CBP Global Entry Yes 2% 3%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
(via U.S. Customs and Border Protection)] Do you plan to enroll in either of these expedited security
screening programs in 2016?
No 81% 73%
Not sure 18% 24%
DCF19_2. [TSA Precheck (via U.S. Transportation Security
Administration)] Do you plan to enroll in either of these expedited security
screening programs in 2016?
Yes 4% 9% No 77% 65%
Not sure 20% 27%
DCF20_1. [Personal
domestic travel] How likely are you to travel by airline in 2016 for the following
reasons and destinations?
5 - Very likely 35% 61% 4 12% 15% 3 15% 13% 2 10% 5%
1 - Not at all likely 29% 6%
DCF20_2. [Personal
international travel] How likely are you to travel by
airline in 2016 for the following reasons and
destinations?
5 - Very likely 14% 26% 4 9% 14% 3 10% 12% 2 11% 12%
1 - Not at all likely 56% 36%
DCF20_3. [Business
domestic travel] How likely are you to travel by airline in 2016 for the following
reasons and destinations?
5 - Very likely 11% 21% 4 7% 11% 3 8% 10% 2 7% 8%
1 - Not at all likely 67% 51%
DCF20_4. [Business
international travel] How likely are you to travel by
airline in 2016 for the following reasons and
destinations?
5 - Very likely 7% 12% 4 5% 9% 3 5% 6% 2 6% 7%
1 - Not at all likely 77% 67%
DCF21. In total, do you think you will take more or fewer flights in 2016 than you did
in 2015?
More flights 25% 32% Fewer flights 17% 16%
About the same number of flights
58% 52%
DCF22_1. [Airline schedules
(routes, timings)] How important are each of the
following when you are making the decision to travel by airline (versus
another mode of travel or versus not going at all)?
5 - Very important 42% 46% 4 32% 36% 3 16% 14% 2 3% 3%
1 - Not at all important
7% 1%
DCF22_2. [Operational reliability (e.g., on-time
5 - Very important 38% 39% 4 31% 35%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
departure/arrival)] How important are each of the
following when you are making the decision to travel by airline (versus
another mode of travel or versus not going at all)?
3 20% 21% 2 4% 3%
1 - Not at all important
7% 2%
DCF22_3. [Quality of inflight
amenities (e.g., food / entertainment / WiFi)] How important are each of the
following when you are making the decision to travel by airline (versus
another mode of travel or versus not going at all)?
5 - Very important 19% 19% 4 22% 25% 3 31% 30% 2 14% 16%
1 - Not at all important
14% 11%
DCF22_4. [Your household
finances] How important are each of the following when you are making the decision to travel by airline (versus another mode of travel or versus not going at all)?
5 - Very important 55% 51% 4 20% 25% 3 15% 17% 2 3% 5%
1 - Not at all important
7% 3%
DCF22_5. [Convenience of the airport] How important
are each of the following when you are making the
decision to travel by airline (versus another mode of
travel or versus not going at all)?
5 - Very important 35% 35% 4 32% 37% 3 21% 20% 2 5% 5%
1 - Not at all important
8% 3%
DCF22_6. [Amenities at the airport] How important are each of the following when you are making the decision to travel by airline (versus another mode of travel or versus not going at all)?
5 - Very important 15% 15% 4 17% 21% 3 32% 31% 2 17% 20%
1 - Not at all important
19% 14%
DCF22_7. [Total travel price
(to get from origin to destination)] How important
are each of the following when you are making the
decision to travel by airline (versus another mode of
travel or versus not going at all)?
5 - Very important 61% 62% 4 20% 25% 3 11% 11% 2 2% 2%
1 - Not at all important
6% 1%
DCF22_8. [Total time spent in travel (to get from origin
to destination)] How important are each of the
5 - Very important 39% 41% 4 31% 36% 3 19% 18% 2 4% 4%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
following when you are making the decision to travel by airline (versus
another mode of travel or versus not going at all)?
1 - Not at all important
7% 2%
DCF22_9. [Perception of
safety] How important are each of the following when you are making the decision to travel by airline (versus another mode of travel or versus not going at all)?
5 - Very important 50% 47% 4 21% 26% 3 17% 19% 2 4% 4%
1 - Not at all important
7% 4%
DCF23_1. [Kiosk/mobile app
functionality] In terms of your preflight experience at the airport, how would you
RANK the following in importance? (Rank the
following from 1 to 7 with 1 being your first priority)
1 6% 7% 2 7% 10% 3 11% 13% 4 11% 12% 5 16% 16% 6 21% 21%
7 28% 21%
DCF23_2. [Availability of free WiFi throughout the airport] In terms of your
preflight experience at the airport, how would you RANK the following in importance? (Rank the
following from 1 to 7 with 1 being your first priority)
1 9% 10% 2 10% 10% 3 18% 20% 4 17% 17% 5 18% 17% 6 15% 15%
7 12% 12%
DCF23_3. [Ease/speed of
getting through security] In terms of your preflight
experience at the airport, how would you RANK the following in importance?
(Rank the following from 1 to 7 with 1 being your first
priority)
1 41% 44% 2 25% 22% 3 10% 10% 4 7% 7% 5 7% 7% 6 5% 5%
7 5% 5%
DCF23_4.
[Availability/quality of airport/airline lounges] In
terms of your preflight experience at the airport, how would you RANK the following in importance?
(Rank the following from 1 to 7 with 1 being your first
priority)
1 6% 6% 2 8% 8% 3 15% 11% 4 17% 15% 5 16% 15% 6 17% 18%
7 21% 27%
DCF23_5.
[Availability/quality of restaurants/concessions] In
terms of your preflight
1 5% 5% 2 8% 7% 3 20% 18% 4 21% 21%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
experience at the airport, how would you RANK the following in importance?
(Rank the following from 1 to 7 with 1 being your first
priority)
5 18% 19% 6 17% 17%
7 12% 12%
DCF23_6. [Ease/efficiency of boarding process] In terms
of your preflight experience at the airport, how would you RANK the following in
importance?(Rank the following from 1 to 7 with 1
being your first priority)
1 28% 23% 2 34% 37% 3 13% 14% 4 9% 10% 5 6% 6% 6 5% 5%
7 5% 5%
DCF23_7. [Personal device-charging stations/options at
gate] In terms of your preflight experience at the
airport, how would you RANK the following in
importance? (Rank the following from 1 to 7 with 1
being your first priority)
1 5% 5% 2 7% 6% 3 13% 14% 4 18% 18% 5 20% 21% 6 21% 19%
7 17% 17%
DCF24_1. [Legroom / seat comfort] In terms of your inflight experience, how
would you RANK the following in
importance?(Rank the following from 1 to 6 with 1
being your first priority)
1 66% 61% 2 16% 19% 3 8% 9% 4 4% 4% 5 2% 3%
6 4% 4%
DCF24_2. [Space for carry-
ons] In terms of your inflight experience, how would you
RANK the following in importance?(Rank the
following from 1 to 6 with 1 being your first priority)
1 15% 17% 2 47% 44% 3 13% 14% 4 9% 10% 5 9% 8%
6 7% 7%
DCF24_3. [Quality of food and beverage options] In
terms of your inflight experience, how would you
RANK the following in importance?(Rank the
following from 1 to 6 with 1 being your first priority)
1 5% 6% 2 13% 12% 3 36% 33% 4 20% 22% 5 14% 14%
6 12% 13%
DCF24_4. [In-seat power] In
terms of your inflight experience, how would you
RANK the following in importance?(Rank the
1 4% 4% 2 6% 6% 3 15% 15% 4 29% 27% 5 24% 25%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
following from 1 to 6 with 1 being your first priority)
6 21% 22%
DCF24_5. [Wi-Fi
availability/reliability/speed] In terms of your inflight
experience, how would you RANK the following in importance?(Rank the
following from 1 to 6 with 1 being your first priority)
1 7% 7% 2 10% 9% 3 14% 15% 4 19% 19% 5 30% 30%
6 20% 20%
DCF24_6. [Entertainment
options (via seat-back display or streaming to your
device)] In terms of your inflight experience, how
would you RANK the following in importance?...
1 4% 5% 2 8% 9% 3 13% 15% 4 19% 18% 5 20% 19%
6 35% 33%
DCF25. Thinking about your overall experience with air travel over the past twelve months, how satisfied or
diss
Very satisfied 22% 35% Somewhat satisfied 29% 44% Neither satisfied nor
dissatisfied 42% 14%
Somewhat dissatisfied 4% 5% Very dissatisfied 3% 1%
DCF26_1. [Fleet (e.g., newer
or refurbished planes)] If you were able to advise the
CEO of a major airline on how to prioritize future
customer-oriented investments in the airline, ...
1 12% 9% 2 11% 11% 3 13% 13% 4 18% 20% 5 16% 17% 6 16% 17% 7 14% 13%
DCF26_2. [Customer service (e.g., friendliness/training of
airline personnel)] If you were able to advise the CEO of a major airline on how to prioritize future customer-oriented investments in the
airline,...
1 19% 16% 2 21% 20% 3 18% 18% 4 14% 15% 5 11% 13% 6 9% 10%
7 8% 8%
DCF26_3. [Airport
improvements (e.g., curbside, check-in, gate
space/amenities, bag carousel/delivery)] If you
were able to advise the CEO of a major airline on how to prioritize future customer-
oriented...
1 8% 7% 2 13% 12% 3 16% 16% 4 16% 14% 5 19% 19% 6 15% 16%
7 13% 16%
DCF26_4. [Route
network/schedule (more flights to more places)] If
1 12% 14% 2 16% 17% 3 16% 18%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
you were able to advise the CEO of a major airline on how to prioritize future
customer-oriented investments in the airline,
how would you...
4 17% 15% 5 16% 14% 6 12% 11%
7 11% 11%
DCF26_5. [Onboard comfort
(seats, meals, room for carry-ons)] If you were able to advise the CEO of a major airline on how to prioritize future customer-oriented investments in the airline,
how would you RANK...
1 35% 39% 2 21% 19% 3 15% 13% 4 10% 10% 5 8% 7% 6 6% 6%
7 5% 6%
DCF26_6. [Onboard
technology (entertainment, WiFi)] If you were able to advise the CEO of a major airline on how to prioritize future customer-oriented investments in the airline,
how would you RANK the...
1 7% 7% 2 10% 12% 3 13% 13% 4 12% 12% 5 15% 15% 6 21% 19%
7 22% 22%
DCF26_7. [Functionality of
airline website and/or mobile applications] If you
were able to advise the CEO of a major airline on how to prioritize future customer-oriented investments in the
airline, how would...
1 6% 8% 2 8% 9% 3 9% 9% 4 13% 14% 5 14% 15% 6 22% 21%
7 27% 23%
DCF27. Which of the following statements do you
agree with
I like paying one all-inclusive ticket price for a bundle/package of services (e.g., seat assignment, checked
bag(s), me
34% 36%
I prefer to pay only (a la carte) for those
airline services/amenities
that I want/need, so my ticket ends up
being less
66% 64%
IPSOS / AIRLINES FOR AMERICA DATA Prepared by Ipsos Public Affairs
How to Calculate Bayesian Credibility Intervals 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 Bayesian 1 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:
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. Ipsos does not publish data for base sizes (sample sizes) below 100.
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