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.
An illustrative example of PPS sampling with 10 districts or counties
| district/county i | population of district/county i, Mi |
cumulative population, Ti |
sampled code R + (j − 1)K |
|---|---|---|---|
|
| |||
| 1 | 1160 | 1160 | |
| 2 | 18160 | 19320 | |
| 3 | 8360 | 27680 | 22020 |
| 4 | 8840 | 36520 | |
| 5 | 12300 | 48820 | |
| 6 | 39440 | 88260 | 69486 |
| 7 | 12260 | 100520 | |
| 8 | 14680 | 115200 | |
| 9 | 10280 | 125480 | 116952 |
| 10 | 16920 | 142400 | |
