Table 2.

OLS, spatial lag, spatial error, and SAC model for the period prevalence (logged), as of June 28, 2020

Variable	OLS		Spatial lag model		Spatial error model		SAC model
	Estimate	SE	Estimate	SE	Estimate	SE	Estimate	SE
(Intercept)	−9.094∗∗∗	0.244	−9.203∗∗∗	0.238	−8.930∗∗∗	0.257	−9.210∗∗∗	0.248
Time	0.349∗∗∗	0.006	0.338∗∗∗	0.006	0.345∗∗∗	0.006	0.342∗∗∗	0.006
Time square	−0.002∗∗∗	0.000	−0.002∗∗∗	0.000	−0.002∗∗∗	0.000	−0.002∗∗∗	0.000
% Blacks	0.543∗∗∗	0.052	0.448∗∗∗	0.051	0.513∗∗∗	0.061	0.465∗∗∗	0.056
% Asians	0.227∗∗∗	0.053	0.243∗∗∗	0.051	0.214∗∗∗	0.056	0.234∗∗∗	0.054
% Hispanic	0.321∗∗∗	0.055	0.280∗∗∗	0.053	0.328∗∗∗	0.064	0.298∗∗∗	0.058
% Native Americans	0.216∗∗∗	0.046	0.227∗∗∗	0.045	0.221∗∗∗	0.050	0.227∗∗∗	0.047
% older than 65 y	−0.087	0.050	−0.119∗	0.049	−0.079	0.054	−0.107∗	0.051
% unemployed	−0.099	0.051	−0.105∗	0.050	−0.087	0.056	−0.099	0.052
Median income (logged)	0.028	0.073	0.000	0.071	0.025	0.078	0.006	0.075
Nonwhite-white segregation index	0.141∗∗∗	0.042	0.139∗∗∗	0.041	0.106∗	0.043	0.125∗∗	0.042
% uninsured	0.074	0.055	0.078	0.054	0.101	0.064	0.085	0.058
% severe housing problems	−0.003	0.053	−0.004	0.052	−0.004	0.056	−0.004	0.054
% work outside the county of residence	0.046	0.045	−0.024	0.044	0.065	0.045	0.004	0.045
Life expectancy	0.176∗∗	0.060	0.185∗∗	0.058	0.181∗∗	0.062	0.187∗∗	0.060
HPSA (ref: no shortage)
The whole county is at shortage	−0.180	0.154	−0.223	0.151	−0.153	0.153	−0.197	0.152
Part of the county is at shortage	−0.051	0.134	−0.049	0.131	−0.019	0.134	−0.034	0.133
Population density (logged)	0.168∗∗∗	0.040	0.089∗	0.040	0.195∗∗∗	0.044	0.121∗∗	0.043
ρ (spatial lag parameter)			0.192∗∗∗				0.139∗∗∗
λ (spatial error parameter)					0.269∗∗∗		0.121∗∗
AIC	13,608		13,501		13,516		13,494
Observed Moran's I for residuals	0.110∗∗∗		0.023∗		−0.008		−0.003

Level of significance: ∗P < .05, ∗∗P < .01, ∗∗∗P < .001.