question:
use a graph to display the observed prevalence of being severely ill at each week for two trt group (1 and 6) separately.
data:
The SAS System
[td]
| Obs | id | trt | week | score | severity |
| 1 | 1 | 6 | 0 | 101 | 1 |
| 2 | 1 | 6 | 1 | 63 | 0 |
| 3 | 1 | 6 | 2 | 67 | 0 |
| 4 | 1 | 6 | 4 | 87 | 1 |
| 5 | 1 | 6 | 6 | 63 | 0 |
| 6 | 1 | 6 | 8 | 62 | 0 |
| 7 | 2 | 1 | 0 | 93 | 1 |
| 8 | 2 | 1 | 1 | 93 | 1 |
| 9 | 2 | 1 | 2 | 49 | 0 |
| 10 | 2 | 1 | 4 | 40 | 0 |
| 11 | 2 | 1 | 6 | 46 | 0 |
| 12 | 2 | 1 | 8 | 62 | 0 |
| 13 | 3 | 6 | 0 | 82 | 1 |
| 14 | 3 | 6 | 1 | 80 | 1 |
| 15 | 3 | 6 | 2 | 79 | 0 |



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