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.

  1. Average age of a married individual
  2. Add or subtract the average age at birth of child
  3. Add or subtract the average age difference between spouses
  4. Age of principal
  5. 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.

  1. Reference date
  2. Child-bearing years
  3. Same delta as the reference date
  4. Average age of mother at the birth of a child
  5. Average age difference between spouses
  6. Average intergenesic interval
For an asymmetric or skewed set of deltas you only have to pick the skew side.

  1. Adult status
  2. End of child-bearing years
  3. Average age at retirement
  4. Average expected age at death
  5. Same ending delta as the reference date
  6. One half the child bearing years
  7. (Absolute) age difference between spouses (2:1 OR 1:2)
In either case there may be one of the following constraints specified:

  1. Either a maximum or a minimum extreme
  2. Size limit to delta:
    1. Average expected age at death
    2. One half the intergenesic interval
    3. Normal age for adult status (gender specific)