Equation

Intercept

Per Capita Personal Income (t-statistic)

Per Capita Personal Income Squared (t-statistic)

Number of Counties (t-statistic)

Adjusted R²

Durbin-Watson

(1)

0.154951 (20.30)*

0.000761 (13.52)*

0.9201

2.1128

(2)

0.181857 (21.12)*

−0.002352 (−7.47)*

0.000062 (10.04)*

0.9237

2.0855

(3)

0.153383 (18.98)*

−0.002567 (−8.47)*

0.000066 (11.14)*

0.000497 (13.71)*

0.9296

2.0883