vft.4p {vitality} | R Documentation |
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.
vft.4p(xx, r, s, u)
xx |
vector of ages |
r |
r value |
s |
s value |
u |
u value |
vector of densities