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.
Joint distribution of treatment A and outcome Y in the target population and data from nonrandom study sample from Table 1 (n=2,000)
| Target population (probabilities) | Study sample (n=2,000) | ||||||
|---|---|---|---|---|---|---|---|
|
|
|
||||||
| Y=0 | Y=1 | Risk | Y=0 | Y=1 | Risk | ||
| A=0 | 0.414 | 0.089 | 0.177 | A=0 | 643 | 383 | 0.373 |
| A=1 | 0.439 | 0.061 | 0.123 | A=1 | 738 | 236 | 0.242 |
|
|
|
||||||
| Risk difference: | −0.055 | −0.131 | |||||
