Table 2 U.S. examples for using the Probabilistic Sampling Method (PSM) for distance estimation
Region of known residence (p) | Smaller areas within the region for which demographic data is available (q) | Typical ratio (q/p) |
|---|---|---|
county | Zip Code, census tract, township, block group, census block | Can vary widely from 36:1 for rural counties to 1000:1 for metropolitan counties. |
Zip Code | Census tract, census block group, census block | From 10:1 to 10,000:1 |
Census tract | Census block group, census block | Variable; 50:1 |
Census tract | 94 Meter grid population data for the U.S. (LandScan U.S.A.) | Highly variable: 1000:1 |