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Explaining Information Effects in Collective Preferences
Unformatted Document Text:  Table 1 Impact of Question Format and Survey Mode on Depletion, Dispersion, and Size of Information Effects Depletion Dispersion Information Effects Average % DK/NOResponses Average Lopsided- ness of Lowest Quartile Average Lopsided- ness of Highest Quartile AveragePointChange inCollectiveOpinions AveragePointChange inIndividualOpinions Question Format Worded as Assertion (n=98) 4.21 a 23.19 24.39 a 6.68 12.39 Not Worded as Assertion (n=137) 7.76 a 23.01 20.24 a 6.36 13.12 Middle Option (n=142) 4.05 a 27.44 a 25.53 a 6.36 12.90 No Middle Option (n=93) 9.68 a 16.43 a 16.54 a 6.69 12.69 Question in Series (n=136) 2.10 a 29.91 a 26.19 a 6.68 12.74 Question Not in Series (n=99) 9.32 a 18.12 a 18.90 a 6.35 12.87 From 1 st Half of Survey (n=86) 5.85 19.95 a 18.97 a 5.98 12.48 From 2 nd Half of Survey (n=149) 6.52 24.90 a 23.71 a 6.79 13.01 Mode of AdministrationFace-to-Face (n=51) 4.99 23.84 23.00 7.09 13.85 Telephone (n=51) 4.89 24.22 22.36 7.09 12.92 a t-value for differences p<.05 Note. Mode of administration differences based on split sample comparison in the 1996 ANES post-election study. Allother differences based on the full set of 235 questions from the 1988, 1992, and 1996 ANES.

Authors: Althaus, Scott.
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Table 1 Impact of Question Format and Survey Mode on Depletion, Dispersion, and Size of Information Effects
Depletion
Dispersion
Information Effects
Average
% DK/NO
Responses
Average
Lopsided-
ness of
Lowest
Quartile
Average
Lopsided-
ness of
Highest
Quartile
Average
Point
Change in
Collective
Opinions
Average
Point
Change in
Individual
Opinions
Question Format
Worded as Assertion (n=98)
4.21
a
23.19
24.39
a
6.68
12.39
Not Worded as Assertion (n=137)
7.76
a
23.01
20.24
a
6.36
13.12
Middle Option (n=142)
4.05
a
27.44
a
25.53
a
6.36
12.90
No Middle Option (n=93)
9.68
a
16.43
a
16.54
a
6.69
12.69
Question in Series (n=136)
2.10
a
29.91
a
26.19
a
6.68
12.74
Question Not in Series (n=99)
9.32
a
18.12
a
18.90
a
6.35
12.87
From 1
st
Half of Survey (n=86)
5.85
19.95
a
18.97
a
5.98
12.48
From 2
nd
Half of Survey (n=149)
6.52
24.90
a
23.71
a
6.79
13.01
Mode of Administration
Face-to-Face (n=51)
4.99
23.84
23.00
7.09
13.85
Telephone (n=51)
4.89
24.22
22.36
7.09
12.92
a
t-value for differences p<.05
Note. Mode of administration differences based on split sample comparison in the 1996 ANES post-election study. All
other differences based on the full set of 235 questions from the 1988, 1992, and 1996 ANES.


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