LL W P = W1
% &
$ $
1
* *
+ , −
2
P Q
* n
( )
' '
" #
! !
+W2( )0 ,
LL:下限、UL:上限、n:集計結果 : 回収率（n／理論的サンプリング）
P:存置派の割合（存置支持者数／n） Q:非存置派の割合（１-P）
P:存置派の割合（存置支持者数／n） Q:非存置派の割合（１-P） 注：理論的サンプリング＝n＋未回収数
表１は上記の分析結果を表している。Pは、内閣府世論調査の報告による存置派 の割合である。LLとULは、調査に回答しなかった者を考慮した可能な割合の下限 値と上限値の間隔を表す。2009年の内閣府世論調査では、回答者の86％が存置派で あった。しかし、調査に回答しなかった者を考慮すると、存置派の占める割合は 54％から92％の間にあると考えられる。これは、他と比べて上限と下限の幅（38％ ポイント）が大きいが、これは2009年の調査での有効回収率（65％）の低さに起因 するものである。
表１は上記の分析結果を表している。Pは、内閣府世論調査の報告による存置派 の割合である。LLとULは、調査に回答しなかった者を考慮した可能な割合の下限 値と上限値の間隔を表す。2009年の内閣府世論調査では、回答者の86％が存置派で あった。しかし、調査に回答しなかった者を考慮すると、存置派の占める割合は 54％から92％の間にあると考えられる。これは、他と比べて上限と下限の幅（38％ ポイント）が大きいが、これは2009年の調査での有効回収率（65％）の低さに起因 するものである。
さらに、2009年内閣府世論調査では、20歳から29歳の年代層の男性の回収率が 最も低く、また同年齢層は死刑廃止支持者が最も多いのは前述の通りである。表１ の性別年齢階層別の集計結果によると、この年齢層は上限と下限の間隔が最も大き く、実際の存置派は34％から95％の幅の間であることになる。
92%.Tis is the largest range (37 percentage points) in comparison to other sweeps, which is due to the lowest response rate (65%) measured by the 2009 survey.
さらに、2009年内閣府世論調査では、20歳から29歳の年代層の男性の回収率が 最も低く、また同年齢層は死刑廃止支持者が最も多いのは前述の通りである。表１ の性別年齢階層別の集計結果によると、この年齢層は上限と下限の間隔が最も大き く、実際の存置派は34％から95％の幅の間であることになる。
表１：存置派の信頼間隔 ① 年齢階層別
1! 1!
Year Year
1967 1967
1975 1975
1980
1994 1999
1999 2004
Year 1980
1967 1989
1989 1975
2004 2009
1975 1994
1980 1980
1989 1989
2009 1999 2004
1994 1994
1999
注：１）1956年内閣府世論調査の信頼間隔は計算に必要な情報入手不可能 ２）LL：下限 UL：上限 W
81% 76% 70%
80% 80%
72% 72%
68% 68%
② 性別年齢階層別（2009年調査） Male W1
22009! !
② 性別年齢階層別（2009年調査） 30-39 47% 90% 40% 98% 58 40-49 52% 90% 45% 97% 52
2009 government survey by gender and age 2009 government survey by gender and age
Male W1 P
20-29 47% 81% 34% 95% 61 20-29 47% 81% 34% 95% 61
30-39 47% 90% 40% 98% 58 P
40-49 52% 90% 45% 97% 52 20-29 47% 81% 34% 95% 61 50-59 61% 86% 49% 95% 46
Male W1 Male W1
50-59 61% 86% 49% 95% 46 30-39 47% 90% 40% 98% 58 60-69 71% 87% 59% 94% 35 40-49 52% 90% 45% 97% 52 50-59 61% 86% 49% 95% 46
70+
60-69 71% 87% 59% 94% 35 40-49 52% 90% 45% 97% 52 74% 84% 58% 92% 34
20-29 47% 81% 34% 95% 61 30-39 47% 90% 40% 98% 58 70+
74% 84% 58% 92% 34
Response rates do matter.Tey matter because where response rates are low, they result in a wide 70+
confidence interval which reduces the reliability of the officially reported proportion of retentionists in the government surveys. Any analyses produced from the government survey should include
confidence interval which reduces the reliability of the officially reported proportion of retentionists in the government surveys. Any analyses produced from the government survey should include Response rates do matter.Tey matter because where response rates are low, they result in a wide
Response rates do matter.Tey matter because where response rates are low, they result in a wide 74% 84% 58% 92% 34
50-59 61% 86% 49% 95% 46 60-69 71% 87% 59% 94% 35
60-69 71% 87% 59% 94% 35 70+
74% 84% 58% 92% 34
50-59 30-39 40-49 50-59 60-69 70+
30-39 40-49 50-59 60-69 70+
68% 86% 55% 94% 39 81% 86% 66% 92% 26
76% 80% 57% 89% 32
81% 86% 66% 92% 26 76% 80% 57% 89% 32
the correction of the bias present in their sample, or at least the bias to be acknowledged, before39 presenting the
results.esenting the results.
ection of the bias present in their sample, or at least the bias to be acknowledged, before confidence interval which reduces the reliability of the officially reported proportion of retentionists
Response rates do matter.Tey matter because where response rates are low, they result in a wide38 confidence interval which reduces the reliability of the officially reported proportion of retentionists in the government surveys. Any analyses produced from the government survey should include ection of the bias present in their sample, or at least the bias to be acknowledged, before
P
注：１）1956年内閣府世論調査の信頼間隔は計算に必要な情報入手不可能 ２）LL：下限 UL：上限 W
!! 1) 1956! 2) LLUL! !!!
2009 government survey by gender and age P
1 ：回収率（n／理論的サンプリング）、P：存置派の割合（存置支持者数） 1 !nP! 2009 government survey by gender and age
Note: 1) Necessary information not available for the 1956 government survey to calculate confidence intervals. 2) LL: Lower limit, UL: Upper limit, W1
W
P: Proportion of retentionists (number of retentionists/n). P: Proportion of retentionists (number of retentionists/n).
LL UL UL–LL Female W1 LL UL UL–LL Female W1
LL UL UL–LL Female W163% 87% 51% 95% 44 LL UL UL–LL Female W1
20-29 30-39 40-49 50-59 60-69 70+
20-29 30-39 40-49 20-29 60-69 70+
20-29 73% 87% 60% 94% 34 48% 84% 36% 96% 60
73% 87% 60% 94% 34 48% 84% 36% 96% 60 68% 86% 55% 94% 39 63% 87% 51% 95% 44
P
1 ：回収率（n／理論的サンプリング）、P：存置派の割合（存置支持者数） !
P: Proportion of retentionists (number of retentionists/n). P: Proportion of retentionists (number of retentionists/n).
P P
LL UL UL–LL LL UL UL–LL
48% 84% 36% 96% 60 48% 84% 36% 96% 60
63% 87% 51% 95% 44 P
LL UL UL–LL LL UL UL–LL
68% 86% 55% 94% 39 63% 87% 51% 95% 44 81% 86% 66% 92% 26 73% 87% 60% 94% 34
81% 86% 66% 92% 26 73% 87% 60% 94% 34 76% 80% 57% 89% 32
76% 80% 57% 89% 32 68% 86% 55% 94% 39
Note: 1) Necessary information not available for the 1956 government survey to calculate confidence intervals. 2) LL: Lower limit, UL: Upper limit, W1
81% 81%
76% 76%
65% 65%
Note: 1) Necessary information not available for the 1956 government survey to calculate confidence intervals. 2) LL: Lower limit, UL: Upper limit, W1
71% 74%
83% 83% 70%
Year ! 80% 1967
80% 81% 76%
W1 W1
70% 70%
72% 72%
2004 2009
2009
68% 68%
65% 65%
62% 67%
71% P
57% 62% 67% 74% 79% 81% 86%
71% 57% P
57% 79%
62% 81%
67% 86%
74% 79% 81% 86%
71% 57% 62% 67% 74% 79% 81% 86%
57% 51%
49% 49%
57% 45% 49% 49% 51% 56% 54% 54%
57% 45% LL
LL
45% 56%
49% 54%
49% 54%
51% 56% 54% 54%
57% 45% 49% 49% 51% 56% 54% 54%
77% 83%
71% 76%
77% 66% 71% 76% 83% 86% 88% 92%
77% 66% UL
66% 86%
71% 88%
76% 92%
83% 86% 88% 92%
77% 66% 71% 76% 83% 86% 88% 92%
34 38
34 38
Note: 1) Necessary information not available for the 1956 government survey to calculate confidence intervals. 2) LL: Lower limit, UL: Upper limit, W1
: Response rate (n/theoretical sample), and : Response rate (n/theoretical sample), and
: Response rate (n/theoretical sample), and : Response rate (n/theoretical sample), and
W1 W1
83% 83%
さらに、2009年内閣府世論調査では、20歳から29歳の年代層の男性の回収率が 最も低く、また同年齢層は死刑廃止支持者が最も多いのは前述の通りである。表１ の性別年齢階層別の集計結果によると、この年齢層は上限と下限の間隔が最も大き く、実際の存置派は34％から95％の幅の間であることになる。
In addition, it was established in the 2009 survey that males in the 20-29 age group were the most under-represented group in the sample, but also the group with most abolitionists. Table 1 (2009 survey by gender and age) shows this group is also the one with the largest interval (61 percentage points), with the true value of retentionists that could range from 34% to 95%.
表１：存置派の信頼間隔 ① 年齢階層別
Table 1: Confidence intervals for retentionists By year
P P
Table 1: Confidence intervals for retentionists By year
Table 1: Confidence intervals for retentionists By year
Table 1: Confidence intervals for retentionists By year
In addition, it was established in the 2009 survey that males in the 20-29 age group were the most under-represented group in the sample, but also the group with most abolitionists. Table 1 (2009 survey by gender and age) shows this group is also the one with the largest interval (61 percentage points), with the true value of retentionists that could range from 34% to 95%.
92%.Tis is the largest range (37 percentage points) in comparison to other sweeps, which is due to the lowest response rate (65%) measured by the 2009 survey.
In addition, it was established in the 2009 survey that males in the 20-29 age group were the most under-represented group in the sample, but also the group with most abolitionists. Table 1 (2009 survey by gender and age) shows this group is also the one with the largest interval (61 percentage points), with the true value of retentionists that could range from 34% to 95%.
LL LL UL UL UL UL–LL
UL–LL 20
20 21
22 20 20
27 21 21
32 22 30
30 27 34
34 32 38
38 30 30
UL–LL 27 32 22 27 32
21 22
UL–LL
In addition, it was established in the 2009 survey that males in the 20-29 age group were the most under-represented group in the sample, but also the group with most abolitionists. Table 1 (2009 survey by gender and age) shows this group is also the one with the largest interval (61 percentage points), with the true value of retentionists that could range from 34% to 95%.
表１は上記の分析結果を表している。Pは、内閣府世論調査の報告による存置派 の割合である。LLとULは、調査に回答しなかった者を考慮した可能な割合の下限 値と上限値の間隔を表す。2009年の内閣府世論調査では、回答者の86％が存置派で あった。しかし、調査に回答しなかった者を考慮すると、存置派の占める割合は 54％から92％の間にあると考えられる。これは、他と比べて上限と下限の幅（38％ ポイント）が大きいが、これは2009年の調査での有効回収率（65％）の低さに起因 するものである。
The Death Penalty in Japan The Death Penalty in Japan The Death Penalty in Japan The Death Penalty in Japan
92%.Tis is the largest range (37 percentage points) in comparison to other sweeps, which is due to the lowest response rate (65%) measured by the 2009 survey.
92%.Tis is the largest range (37 percentage points) in comparison to other sweeps, which is due to the lowest response rate (65%) measured by the 2009 survey.
W2 : 未回収率（未回収数／理論的サンプリング） 注：理論的サンプリング＝n＋未回収数
注：理論的サンプリング＝n＋未回収数
P:存置派の割合（存置支持者数／n） Q:非存置派の割合（１-P）
UL W P =
% &
$ $
1
* *
+ , +
2
P Q
* n
( )
' '
" #
! !
+W2( )1
in the government surveys. Any analyses produced from the government survey should include the correction of the bias present in their sample, or at least the bias to be acknowledged, before39
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