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This function is used in the calculation of the fitted intrinsic (mu.vd1.4p) and total (mu.vd.4p) mortality rate in the 4-parameter model.
mu.vd1.4p
mu.vd.4p
ft.4p(xx, r, s, u)
age
r value
s value
u value
density
vft.4p, ft.6p
vft.4p
ft.6p