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. Author manuscript; available in PMC: 2023 May 25.
Published in final edited form as: J Health Econ. 2020 May 18;73:102319. doi: 10.1016/j.jhealeco.2020.102319

Table 11.

Difference-in-difference estimation with different levels of observation. Y = DRG weight in current year.

DiD collapsed to DRG-Year-Hospital DiD collapsed to DRG-Year
Post * expanded DRG 0.0876** 0.0755
(0.0292) (0.0650)
2007 weights 0.997*** 0.986***
(0.0222) (0.0506)
Observations 1716919 3637

Notes: This table estimates Equation 2 without the individual characteristics, Xi. Column (1) represents the data collapsed to the DRG-Year-Hospital level of observation. Column (2) collapses to the DRG-Year level of observation. Standard errors are in parentheses and clustered at the DRG level.

*

p<0.05

**

p<0.01

***

p<0.001.