Table 2.
Demographics and Unweighted and Weighted Percent of Twelfth-Grade Illicit Drug Users, by Target Population and Samples
| Demographics
|
% 12th grade illicit drug users
|
|||||||
|---|---|---|---|---|---|---|---|---|
| 12th grade nonusers (NU) | 12th grade illicit drug users (DU) | No weight applied | W1 sample weight applied | W2 attrition weight applied | W2 combo weight applied | |||
|
| ||||||||
| N | % | N | % | |||||
| Target Population | - | 87.50% | - | 12.5% | 12.5% | -- | -- | -- |
| MTF W1 Sample | 45,324 | 70% | 19,515 | 30% | 30% | 12.5%1 | -- | -- |
| MTF W2 Sample | 32,549 | 72% | 12,645 | 28% | 28% | -- | 30%2 | 12.5%3 |
1
=[W1 % DU]+[W1 DU sample weight]
- = [30 %]+[__=]
- = 12.5%
2
=[W2 % DU]+[W2 DU attrition weight]
- =[28%]+[1.071]
- =30%
3
=[W2 % DU]+[W2 DU combo weight]
- =[28%]+[.446]
- =12.5%
Notes. Calculations for sample, attrition and combo weights are presented in Table 3