Table 5 The percentage of respondents potentially required to answer in a revealing way as the function of model design and prevalence rate of the sensitive question
Design | Innocuous | Sensitivea | ||||||
|---|---|---|---|---|---|---|---|---|
5% | 10% | 15% | 20% | 30% | 40% | 50% | ||
1 + 1 | 50.00 | 2.50 | 5.00 | 7.50 | 10.00 | 15.00 | 20.00 | 25.00 |
2 + 1 | 25.00 | 1.25 | 2.50 | 3.75 | 5.00 | 7.50 | 10.00 | 12.50 |
3 + 1 | 12.50 | 0.62 | 1.25 | 1.87 | 2.50 | 3.75 | 5.00 | 6.25 |
4 + 1 | 6.25 | 0.31 | 0.62 | 0.94 | 1.25 | 1.87 | 2.50 | 3.12 |
5 + 1 | 3.12 | 0.16 | 0.31 | 0.48 | 0.62 | 0.94 | 1.25 | 1.56 |
6 + 1 | 1.56 | 0.08 | 0.16 | 0.23 | 0.31 | 0.47 | 0.62 | 0.78 |
7 + 1 | 0.78 | 0.04 | 0.08 | 0.12 | 0.16 | 0.23 | 0.31 | 0.39 |
8 + 1 | 0.39 | 0.02 | 0.04 | 0.06 | 0.08 | 0.12 | 0.16 | 0.19 |