Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Coding schemes.
| Grouping | Time | Treatment (persistent effect) | Treatment (fleeting effect) |
|---|---|---|---|
| No treatment | 0 | 0 | 0 |
| 1 | 0 | 0 | |
| 2 | 0 | 0 | |
| 3 | 0 | 0 | |
| Year-1 treatment only | 0 | 0 | 0 |
| 1 | 1 | 1 | |
| 2 | 1 | 0 | |
| 3 | 1 | 0 | |
| Year-2 treatment only | 0 | 0 | 0 |
| 1 | 0 | 0 | |
| 2 | 0 | 0 | |
| 3 | 1 | 1 | |
| Both years treatment | 0 | 0 | 0 |
| 1 | 1 | 1 | |
| 2 | 1 | 0 | |
| 3 | 2 | 1 |
