life table gompertz models hazards models cox proportional hazards models multiple decrement life tables brass relational logits fertility hernes model coale trussell models parity progression ratios marriage singulate mean marriage page model disability sullivan 's method multistate life tables population projections lee carter model leslie matrix population momentum keyfitz united kingdom series four national birth cohort studies first three spaced apart years national survey health development national child development study british cohort study millennium cohort study begun much recently
Social science Sociology Demography