Increment - decrement life tables: some further comments from a demographic-accounting point of view

The paper examines the problem of the estimation of the correct probabilities needed as input to a multiregional life table. A variety of alternative methods are examined by use of an expanded notation and a hypothetical test case. This theoretical investigation suggests that methods proposed by previous researchers are in error and an alternative method is proposed. However, this error is likely to be small in cases where the probabilities of transition from one region to another are small.