Table 4.
Difference-in-Differences Model of Total Inpatient Spending for Gainers and Nevers
| Fixed-effects (within) Regression Group Variable (i): baseid R2: within=0.0036 between=0.0035 overall=0.0007 Corr(u_i,Xb)=-0.8453 |
Number of obs=13,680 Number of groups=1,401 Obsper group: min=8 avg=9.8 max=16 F(14, 12265)=3.19 Prob> F=0.0000 |
|||||
|---|---|---|---|---|---|---|
| Total Inpatient | Coefficent | SE. | t | p>∣t∣ | [95% Confidence Interval] | |
| y1996 | 187.791 | 54.95742 | 3.42 | 0.001 | 80.06581 | 295.5162 |
| y1997 | 197.1407 | 79.44047 | 2.48 | 0.013 | 41.42485 | 352.8565 |
| y1998 | 278.7367 | 103.0436 | 2.71 | 0.007 | 76.75515 | 480.7183 |
| y1999 | 384.1231 | 127.8534 | 3.00 | 0.003 | 133.5104 | 634.7359 |
| y2000 | 441.7032 | 150.1892 | 2.94 | 0.003 | 147.3087 | 736.0976 |
| Age | −336.8673 | 434.3684 | −0.78 | 0.438 | −1,188.298 | 514.5632 |
| Age2 | 1.850741 | 2.72236 | 0.68 | 0.497 | −3.485513 | 7.186995 |
| Married | 10.11199 | 241.6825 | 0.04 | 0.967 | −463.6238 | 483.8478 |
| Income | .1033875 | 1.45629 | 0.07 | 0.943 | −2.751171 | 2.957946 |
| Metro | −145.9165 | 716.1161 | −0.20 | 0.839 | −1,549.617 | 1,257.784 |
| HCC Index | 121.5006 | 35.7935 | 3.39 | 0.001 | 51.33974 | 191.6615 |
| Postperiod | 44.89839 | 37.38742 | 1.20 | 0.230 | −28.38683 | 118.1836 |
| Gain | −22.63968 | 135.5702 | −0.17 | 0.867 | −288.3786 | 243.0992 |
| Post × gain | −14.70328 | 63.81229 | −0.23 | 0.818 | −139.7854 | 110.3789 |
| _cons | 14,946.69 | 17,388.75 | 0.86 | 0.390 | −19,138 | 49,031.38 |
| sigma_u | 931.39804 | |||||
| sigma_e | 1,420.2969 | |||||
| rho | .30072056 (fraction of variance because of u_i) | |||||