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. Author manuscript; available in PMC: 2020 Aug 24.
Published in final edited form as: Am Econ J Econ Policy. 2019 Feb;11(1):192–221. doi: 10.1257/pol.20150421

Figure 3.

Figure 3

Notes: Panel A presents a HRR-level histogram of averages from the cardiology survey for the 74 HRRs in the main analysis sample. Panel B shows the distribution of high follow-up cardiologists in this sample. A simulated distribution based on 1,000 bootstrap samples under the null hypothesis that individuals were randomly assigned to areas is superimposed on the observed distributions. p-values for over-dispersion are reported in Table 1 and indicate that the observed variation is significantly greater than can be explained by random variation.