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. Author manuscript; available in PMC: 2016 Dec 5.
Published in final edited form as: Am Econ J Econ Policy. 2015 Nov;7(4):41–70. doi: 10.1257/pol.20140262

Table 1.

Smoothness of Covariates

Share
employed
Share
retired
Share
married
Income Family
size
Share
male
Share with
less than
HS degree
Share
Hispanic
Panel A. MEPS 2007–2010
Age 65+ 0.01
(0.039)
−0.036
(0.032)
0.052***
(0.020)
2,287
(4,017)
0.023
(0.057)
0.005
(0.036)
0.001
(0.023)
0.006
(0.011)
Mean pre-65 0.69 0.087 0.665 44,154 2.42 0.490 0.153 0.092
F-statistic 1.25 1.51 1.45 1.31 1.53 1.76 1.10 0.75
Observations 32,569 32,241 32,569 32,569 32,569 32,569 32,569 32,569
Panel B. HTHS 2003, 2007, 2010
Age 65+ −0.014
(0.015)
0.043**
(0.017)
1,163
(1,381)
0.045*
(0.026)
−0.09***
(0.011)
−0.036***
(0.016)
−0.021
(0.02)
Mean pre-65 0.588 0.692 51,419 2.07 0.486 0.128 0.087
F-statistic 1.48 3.9 1.12 2.31 1.23 3.46 4.51
Observations 30,172 30,172 30,172 30,172 30,172 30,172 30,172

Notes: Both panels include respondents aged 50 to 80 years. All regressions include a constant, an indicator for ages 65 and above. Regressions in panel A include a fifth-order polynomial; panel B uses a fourth-order polynomial rather than a fifth-order polynomial because of the sparser data, the availability of age in years only, and what appeared to be better parametric fits. Standard errors are clustered at the level of age in quarters in the MEPS and by age in years in the HTHS.

***

Significant at the 1 percent level.

**

Significant at the 5 percent level.

*

Significant at the 10 percent level.

Source: Data in panel A are from the 2007–2010 Medical Expenditure Panel Surveys. Panel B data are from the 2003, 2007, and 2010 Health Tracking Household Survey.