define APC combination to return in kin
and kin2sex
.
output_period_cohort_combination(
output_cohort = NULL,
output_period = NULL,
age = NULL,
years_data = NULL
)
data.frame with years and ages to filter in kin
and kin_2sex
functions.
Because returning all period and cohort data from a huge time-series would be hard memory consuming,
this function is an auxiliary one to deal with selection from inputs output_cohort
and output_period
.