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Effects of Splitting 
Long Surveys Into Two 
Annie Pettit 
Chief Research Officer 
Tweet! #AAPOR @LoveStats
90 77 79 73 72 62 
43 40 34 31 21 14 
36 28 25 21 15 9 
http://www.people-press.org/2012/05/15/assessing-the-representativeness-of-public-opinion-surveys/ 
Tweet! #AAPOR @LoveStats
50% of surveys are >=15 minutes 
5 10 15 20 25 30 35 40 45 50 55 60+ 
Tweet! #AAPOR @LoveStats 
Source: DIY Sampling Panel
Tweet! #AAPOR @LoveStats 
12 Minute 
Survey 
N=300 
Split 
incentive 
Method 
12 Minute 
Survey 
N=300 
Split 
incentive 
20 Minute 
Survey 
N=600 
Full 
incentive
Problem: 
Nothing is directly Comparable 
• People choose whether to participate 
• Each version is different 
– Different length 
– Different topics 
– Different leading/priming questions 
Tweet! #AAPOR @LoveStats
Tweet! #AAPOR @LoveStats 
Agenda 
1. Data quality 
2. Data equivalence 
3. Responder satisfaction 
11/6/2014 6
Data Quality 
11/6/2014 7 
Tweet! #AAPOR @LoveStats
Fewer Red Herrings 
    
Tweet! #AAPOR @LoveStats 
2 fake hotels 
2 fake airlines 
2 fake loyalty programs
Straightlining 
  
P<.05 
Tweet! #AAPOR @LoveStats 
50% 
40% 
30% 
20% 
10% 
0% 
Fail 
Straight 
1 
Fail 
Straight 
6 
Fail 
Straight 
10 
Fail 
Straight 
64 
Fail 
Straight 
66 
Fail 
Straight 
85 
Fail 
Straight 
91 
Fail 
Straight 
93 
Fail 
Straight 
104 
Long Short A Short B
Follow Instructions Better 
  
Did not follow instruction to “choose only one” 
Tweet! #AAPOR @LoveStats
Better Open Ends 
     
Tweet! #AAPOR @LoveStats 
Optional
Speeding differences not discernable 
Tweet! #AAPOR @LoveStats 
Long 
Short A 
Short B 
Standardized Number of Seconds 
m=0, sd=1, ceiling outliers removed
Drop the worst 5% 
from each dataset 
6.1% of Long 
6.3% of Short A 
5.2% of Short B 
Tweet! #AAPOR @LoveStats
Data 
Equivalence 
Tweet! #AAPOR @LoveStats
Survey Middle: Trips Taken 
  
Tweet! #AAPOR @LoveStats 
80% 
60% 
40% 
20% 
0% 
1 to 3 trips 4 or more trips 
Long Short A Short B
Survey Middle: Airline Aware 
P<.05 P<.05 
Tweet! #AAPOR @LoveStats 
P<.05 
P<.05 
100% 
75% 
50% 
25% 
0% 
Long Short A Short B
Survey End: Like Advertising 
Tweet! #AAPOR @LoveStats 
60% 
50% 
40% 
30% 
20% 
10% 
0% 
Youtube Facebook Flyers Billboards 
Long Short A Short B 
P<.05 
  
Survey End: Privacy Concerns 
     
Tweet! #AAPOR @LoveStats 
60% 
40% 
20% 
0% 
Top2Q91privacy Top2Q91security Top2Q91family Top2Q91home Top2Q91online 
Long ShortB
Survey End: Personality 
      
Tweet! #AAPOR @LoveStats
Respondent 
Engagement 
Tweet! #AAPOR @LoveStats
Same Completion Trend 
Optional 
watch a 
commercial 
Optional 
watch a 
commercial 
Tweet! #AAPOR @LoveStats 
100% 
75% 
50% 
25% 
Long Short A Short B 
Grid
More Words in Verbatim 
    
Tweet! #AAPOR @LoveStats 
60 
40 
20 
0 
Verbatim 1 Verbatim 2 Verbatim 3 Verbatim 4 Verbatim 5 Verbatim 6 
Long ShortA ShortB 
Optional 
P<.05
Possibly Higher Satisfaction 
P<.05   
P<.05 
Tweet! #AAPOR @LoveStats 
100% 
75% 
50% 
25% 
0% 
Easy Boring Long Reco 
Long Short A Short B 
P<.05
More Positive Survey Comments 
Tweet! #AAPOR @LoveStats 
75% 
86% 
93% 
Long Short A Short B 
Percentage of optional survey comments that were positive
Conclusions 
• Not a slam-dunk win 
• Data quality is as good or better 
• Results are equivalent 
• Survey satisfaction is as good or 
better 
Tweet! #AAPOR @LoveStats
Final Thoughts 
• Responders self-select for a 10 or 20 minute 
Tweet! #AAPOR @LoveStats 
experience 
• Differences are in line with sampling error 
• Large portions of most surveys do 
not need to be answered by everyone. 
Plan ahead.
Thank you! 
Annie Pettit 
Chief Research Officer 
Peanut Labs 
annie@peanutlabs.com 
@LoveStats on Twitter 
www.peanutlabs.com 
Tweet! #AAPOR @LoveStats 
: )

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Effects of splitting long surveys into two

  • 1. Effects of Splitting Long Surveys Into Two Annie Pettit Chief Research Officer Tweet! #AAPOR @LoveStats
  • 2. 90 77 79 73 72 62 43 40 34 31 21 14 36 28 25 21 15 9 http://www.people-press.org/2012/05/15/assessing-the-representativeness-of-public-opinion-surveys/ Tweet! #AAPOR @LoveStats
  • 3. 50% of surveys are >=15 minutes 5 10 15 20 25 30 35 40 45 50 55 60+ Tweet! #AAPOR @LoveStats Source: DIY Sampling Panel
  • 4. Tweet! #AAPOR @LoveStats 12 Minute Survey N=300 Split incentive Method 12 Minute Survey N=300 Split incentive 20 Minute Survey N=600 Full incentive
  • 5. Problem: Nothing is directly Comparable • People choose whether to participate • Each version is different – Different length – Different topics – Different leading/priming questions Tweet! #AAPOR @LoveStats
  • 6. Tweet! #AAPOR @LoveStats Agenda 1. Data quality 2. Data equivalence 3. Responder satisfaction 11/6/2014 6
  • 7. Data Quality 11/6/2014 7 Tweet! #AAPOR @LoveStats
  • 8. Fewer Red Herrings     Tweet! #AAPOR @LoveStats 2 fake hotels 2 fake airlines 2 fake loyalty programs
  • 9. Straightlining   P<.05 Tweet! #AAPOR @LoveStats 50% 40% 30% 20% 10% 0% Fail Straight 1 Fail Straight 6 Fail Straight 10 Fail Straight 64 Fail Straight 66 Fail Straight 85 Fail Straight 91 Fail Straight 93 Fail Straight 104 Long Short A Short B
  • 10. Follow Instructions Better   Did not follow instruction to “choose only one” Tweet! #AAPOR @LoveStats
  • 11. Better Open Ends      Tweet! #AAPOR @LoveStats Optional
  • 12. Speeding differences not discernable Tweet! #AAPOR @LoveStats Long Short A Short B Standardized Number of Seconds m=0, sd=1, ceiling outliers removed
  • 13. Drop the worst 5% from each dataset 6.1% of Long 6.3% of Short A 5.2% of Short B Tweet! #AAPOR @LoveStats
  • 14. Data Equivalence Tweet! #AAPOR @LoveStats
  • 15. Survey Middle: Trips Taken   Tweet! #AAPOR @LoveStats 80% 60% 40% 20% 0% 1 to 3 trips 4 or more trips Long Short A Short B
  • 16. Survey Middle: Airline Aware P<.05 P<.05 Tweet! #AAPOR @LoveStats P<.05 P<.05 100% 75% 50% 25% 0% Long Short A Short B
  • 17. Survey End: Like Advertising Tweet! #AAPOR @LoveStats 60% 50% 40% 30% 20% 10% 0% Youtube Facebook Flyers Billboards Long Short A Short B P<.05   
  • 18. Survey End: Privacy Concerns      Tweet! #AAPOR @LoveStats 60% 40% 20% 0% Top2Q91privacy Top2Q91security Top2Q91family Top2Q91home Top2Q91online Long ShortB
  • 19. Survey End: Personality       Tweet! #AAPOR @LoveStats
  • 20. Respondent Engagement Tweet! #AAPOR @LoveStats
  • 21. Same Completion Trend Optional watch a commercial Optional watch a commercial Tweet! #AAPOR @LoveStats 100% 75% 50% 25% Long Short A Short B Grid
  • 22. More Words in Verbatim     Tweet! #AAPOR @LoveStats 60 40 20 0 Verbatim 1 Verbatim 2 Verbatim 3 Verbatim 4 Verbatim 5 Verbatim 6 Long ShortA ShortB Optional P<.05
  • 23. Possibly Higher Satisfaction P<.05   P<.05 Tweet! #AAPOR @LoveStats 100% 75% 50% 25% 0% Easy Boring Long Reco Long Short A Short B P<.05
  • 24. More Positive Survey Comments Tweet! #AAPOR @LoveStats 75% 86% 93% Long Short A Short B Percentage of optional survey comments that were positive
  • 25. Conclusions • Not a slam-dunk win • Data quality is as good or better • Results are equivalent • Survey satisfaction is as good or better Tweet! #AAPOR @LoveStats
  • 26. Final Thoughts • Responders self-select for a 10 or 20 minute Tweet! #AAPOR @LoveStats experience • Differences are in line with sampling error • Large portions of most surveys do not need to be answered by everyone. Plan ahead.
  • 27. Thank you! Annie Pettit Chief Research Officer Peanut Labs annie@peanutlabs.com @LoveStats on Twitter www.peanutlabs.com Tweet! #AAPOR @LoveStats : )