1. The parameters in the Reference Group model fit by EPP
 The parameters in the Reference Group model fit by EPP. r, The rate of growth of the epidemic; f0, the fraction of the population considered to be at risk of infection at the start of the epidemic; t0 the start year of the epidemic; φ a parameter that relates recruitment to the at-risk population to declines in the at-risk population due to AIDS mortality.
 The parameters in the Reference Group model fit by EPP. r, The rate of growth of the epidemic; f0, the fraction of the population considered to be at risk of infection at the start of the epidemic; t0 the start year of the epidemic; φ a parameter that relates recruitment to the at-risk population to declines in the at-risk population due to AIDS mortality.
P D Ghys et al. Sex Transm Infect 2004;80:i5-i9
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