1-6.12 Parameters needed for calculations.
The reference date is the date of the event
document or vital event of P1. Any of the following parameters may be required.
- Average age of a married individual
- Add or subtract the average age at birth of child
- Add or subtract the average age difference between spouses
- Age of principal
- Add or subtract the average size of a generation
Another parameter is a set of deltas, days to add and subtract from the reference date to get
a time period. The positive and negative may be identical (symmetric) or different (asymmetric or
skewed). There may also be constraints on the deltas. For a symmetric set of deltas you only have
to specify one span for both sides and each generation of the relationship, which is then averaged.
- Reference date
- Child-bearing years
- Same delta as the reference date
- Average age of mother at the birth of a child
- Average age difference between spouses
- Average intergenesic interval
For an asymmetric or skewed set of deltas you only have to pick the skew side.
- Adult status
- End of child-bearing years
- Average age at retirement
- Average expected age at death
- Same ending delta as the reference date
- One half the child bearing years
- (Absolute) age difference between spouses (2:1 OR 1:2)
In either case there may be one of the following constraints specified:
- Either a maximum or a minimum extreme
- Size limit to delta:
- Average expected age at death
- One half the intergenesic interval
- Normal age for adult status (gender specific)