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The difference-in-difference method: assessing the selection bias in the effects of neighborhood environment on
Irina B Grafova1, Vicki A Freedman2, Nicole Lurie3
1University of Medicine and Dentistry of New Jersey, United States.
Abstract:
This paper uses the difference-in-difference estimation approach to explore the self-selection bias in estimating the effect of neighborhood economic environment on self-assessed health among older adults. The results indicate that there is evidence of downward bias in the conventional estimates of the effect of neighborhood economic disadvantage on self-reported health, representing a lower bound of the true effect.
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