Salk Vaccine Field Trial
Randomized Placebo Control Approach의 특징

Randomization
Red |
152 |
26 |
45 |
5 |
228 |
Black |
146 |
28 |
49 |
3 |
226 |
계 |
298 |
54 |
94 |
8 |
454 |
Pearson’s Chi-squared test with simulated p-value (based on 2000 replicates): .
0.3651 |
NA |
0.8486 |
Clear Evidence of Vaccine Effects

Treatment vs Control
Red |
13 |
177 |
24 |
14 |
228 |
Black |
13 |
156 |
37 |
20 |
226 |
계 |
26 |
333 |
61 |
34 |
454 |
Polio Rates of 3rd Grades

Control group of NFIP design
Red |
19 |
37 |
36 |
136 |
228 |
Black |
22 |
40 |
35 |
129 |
226 |
계 |
41 |
77 |
71 |
265 |
454 |
Control group of NFIP Design (%)
Cognitive Response Test
야구 방망이와 공세트

집계
Red(10센트 먼저) |
101 |
127 |
228 |
Black(5센트 먼저) |
110 |
116 |
226 |
계 |
211 |
243 |
454 |
Pearson’s Chi-squared test with simulated p-value (based on 2000 replicates): .
0.873 |
NA |
0.3973 |
% 비교.
Red(10센트 먼저) |
44.3 |
55.7 |
100.0 |
Black(5센트 먼저) |
48.7 |
51.3 |
100.0 |
가발 만드는 기계

집계
Red(100분 먼저) |
73 |
155 |
228 |
Black(5분 먼저) |
58 |
168 |
226 |
계 |
131 |
323 |
454 |
Pearson’s Chi-squared test with simulated p-value (based on 2000 replicates): .
2.232 |
NA |
0.1399 |
% 비교.
Red(100분 먼저) |
32.0 |
68.0 |
100.0 |
Black(5분 먼저) |
25.7 |
74.3 |
100.0 |
호수에 수련

집계
Red(24일 먼저) |
97 |
131 |
228 |
Black(47일 먼저) |
84 |
142 |
226 |
계 |
181 |
273 |
454 |
Pearson’s Chi-squared test with simulated p-value (based on 2000 replicates): .
1.368 |
NA |
0.2504 |
% 비교.
Red(24일 먼저) |
42.5 |
57.5 |
100.0 |
Black(47일 먼저) |
37.2 |
62.8 |
100.0 |