convert_age_to_cir {LTFHPlus}

Convert age to cumulative incidence rate

Description

convert_age_to_cir computes the cumulative incidence rate from a person's age.

Usage

convert_age_to_cir(age, pop_prev = 0.1, mid_point = 60, slope = 1/8)

Arguments

age

A non-negative number representing the individual's age.

pop_prev

A positive number representing the overall population prevalence. Must be at most 1. 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.

Details

Given a person's age, convert_age_to_cir can be used to compute the cumulative incidence rate (cir), which is given by the formula

pop\_ prev / (1 + exp((mid\_ point - age) * slope))

Value

If age 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_age_to_cir returns a number, which is equal to the cumulative incidence rate.

Examples

curve(sapply(age, convert_age_to_cir), from = 10, to = 110, xname = "age")