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Table 1 Fit of seroprevalence data to seroprevalence model under different force of infection (FOI) functions

From: A review of data needed to parameterize a dynamic model of measles in developing countries

Africa
FOI
Function
Best-fit k1 Best-fit k2 Best-fit k3 Least sum-of-squares F ratio
Constant 0.315 --* 3.59 0.042 --
Linear 0.377 0.055 3.56 0.036 0.33
Exponential 0.427 0.108 3.58 0.034 0.48
Unimodal 0.532 0.452 2.88 0.044 -- **
India
FOI
Function
Best-fit k 1 Best-fit k 2 Best-fit k 3 Least sum-of-squares F ratio
Constant 0.275 --* 2.97 0.0185 --
Linear 0.410 0.103 3.16 0.0058 4.33
Exponential 0.468 0.199 3.26 0.0059 4.25
Unimodal 0.598 0.568 2.81 0.0077 2.76
  1. *No k2 parameter in function.
  2. ** An F ratio was not computed because least sum-of-squares was greater than the constant case.