This function projects the population for a specified number of years based on the input parameters.
Arguments
- pop_s
A data frame or matrix representing the initial population structure by age and sex.
- asfr
A vector of age-specific fertility rates.
- srb
Sex ratio at birth (number of male births per 100 female births).
- project_year
Number of years to project.
- age_group
A vector of age groups.
- lx_male
A vector of male survival rates.
- lx_female
A vector of female survival rates.