group01: group down standard abridged data in child mortality group
Description
We want 5-year age groups starting from 0. Standard abridged data has 0i,1,5. So we need to group together 0 and 1. Just for the sake of getting comparable results.
Usage
group01(X)
Arguments
X
standard input as required by ddm(), ggb(), bh1(), or bh2()