convert_cir_to_age computes the age
from a person's cumulative incidence rate.
convert_cir_to_age(cir, pop_prev = 0.1, mid_point = 60, slope = 1/8)Arguments
- cir
A positive number representing the individual's cumulative incidence rate.
- pop_prev
A positive number representing the overall population prevalence. Must be at most 1 and must be larger than cir. Defaults to 0.1.
- mid_point
A positive number representing the mid point logistic function. Defaults to 60.
- slope
A number holding the rate of increase. Defaults to 1/8.
Value
If cir and mid_point are positive numbers, if pop_prev
is a positive number between 0 and 1 and if slope is a valid number,
then convert_cir_to_age returns a number, which is equal to
the current age.
Details
Given a person's cumulative incidence rate (cir), convert_cir_to_age
can be used to compute the corresponding age, which is given by
$$mid\_ point - \log(pop\_ prev/cir - 1) * 1/slope$$
