Figure 2

Bias in new cases. Percent bias in new cases as a function of the fraction of sensitive cases presenting to the public sector (x _S ) and the fraction of resistant cases presenting to the public sector (x _R ). Blue represents parameter space in which public sector surveys overestimate total resistance and red represents parameter space in which public sector surveys underestimate total resistance; more saturated colors indicate greater bias. The values on the lines indicate percent bias. Results reported for models at equilibrium with a _N = 0.1; a _P = 0.1; f _SN = 0.1; f _SP = 0.1; f _RN = 0.25; f _RP = 0.25; l = 0.2; q = 0.6; r _N = 0.85; r _P = 0.5.