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.
PSM匹配情况汇总
| Item | Data |
| Matching mode |
K-nearest neighbor matching |
| Sampling | Put back sampling |
| Number to match | 72 |
| Number of successful exact matching | 1 |
| Number of successful indistinct matching | 71 |
|
Number of successful matches (exact+indistinct) |
72 |
| Ratio of successful matching | 100.000% |
| Ratio of matching failure | 0.000% |
