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Global Tuberculosis Control 2010 - Florida Department of Health

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parameter (except for notifications and population<br />

values) in Monte Carlo simulations, with the number<br />

<strong>of</strong> simulation runs set so that they were sufficient to<br />

ensure stability in the outcome distributions. The same<br />

random generator seed was used for every country, and<br />

errors were assumed to be time-dependent within countries<br />

(thus generating autocorrelation in time-series).<br />

Regional parameters were used in some instances (for<br />

example, for CFRs). Summaries <strong>of</strong> quantities <strong>of</strong> interest<br />

were obtained by extracting the 2.5th, 50th and 97.5th<br />

centiles <strong>of</strong> posterior distributions. The country-specific<br />

estimates produced using the just-described simulations<br />

were then used as the building blocks for further simulations,<br />

from which aggregated summaries at global and<br />

regional levels for incidence, prevalence and mortality<br />

were drawn. Two sets <strong>of</strong> simulations were run, the first<br />

to produce aggregates at regional level and the second<br />

to produce aggregates at global level. These summary<br />

estimates are the result <strong>of</strong> simulations based on nonsymmetric<br />

distributions. As a result, best estimates for<br />

regions do not necessarily sum to the best estimate for<br />

the world.

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