TABLE 1.
Nationwide aggregate demographic proportions in zip codes around empirical testing sites compared to random placement
| Date | Tranche (Sites analysed of new sites) | Geography | White | Hispanic | Black | |||
|---|---|---|---|---|---|---|---|---|
| Aggregate proportion (standard deviation) | p‐value of disparity | Aggregate proportion (standard deviation) | p‐value of disparity | Aggregate proportion (standard deviation) | p‐value of disparity | |||
| Apr 16 | CUMULATIVE (2821 sites) | Empirical zip codes with testing sites | 63.03% | .32 | 14.76% | .002* | 11.99% | .20 |
| Mean for randomly distributed sites | 63.25% (0.32%) | 15.39% (0.22%) | 11.79% (0.24%) | |||||
| May 7 |
NEW SITES (6081 sites) |
Empirical zip codes with testing sites | 63.39% | <.001* | 17.46% | <.001* | 10.49% | .28 |
| Mean for randomly distributed sites | 62.59% (0.21%) | 18.59% (0.15%) | 10.58% (0.15%) | |||||
|
CUMULATIVE (8346 total sites) |
Empirical zip codes with testing sites | 63.46% | .001* | 16.64% | <.001* | 10.81% | .32 | |
| Mean for randomly distributed sites | 62.89% (0.18%) | 17.63% (0.13%) | 10.87% (0.13%) | |||||
| May 28 |
NEW SITES (3821 sites) |
Empirical zip codes with testing sites | 61.03 | <.001* | 15.99% | .22 | 15.21% | <.001* |
| Mean for randomly distributed sites | 62.30% (0.28%) | 15.85% (0.18%) | 14.17% (0.22%) | |||||
|
CUMULATIVE (10,281 total sites) |
Empirical zip codes with testing sites | 62.81% | .06 | 16.00% | <.001* | 12.53% | .002* | |
| Mean for randomly distributed sites | 63.07% (0.17%) | 16.44% (0.11%) | 12.17% (0.13%) | |||||
*Indicates significance at p < .05.
Aggregate proportion is the average demographic proportion of a given race in zip codes, either those around empirical testing sites or those around random simulations of testing site distributions. From the random Monte Carlo Simulations, the mean aggregate proportion is reported along with standard deviation.