Conditional probabilistic population forecasting

Since policy-makers often prefer to think in terms of alternative scenarios, the question has arisen as
to whether it is possible to make conditional population forecasts in a probabilistic context. This paper
shows that it is both possible and useful to make these forecasts. We do this with two different kinds of
examples. The first is the probabilistic analog of deterministic scenario analysis. Conditional probabilistic
scenario analysis is essential for policy-makers because it allows them to answer “what if” type questions
properly when outcomes are uncertain. The second is a new category that we call “future jump-off date
forecasts”. Future jump-off date forecasts are valuable because they show policy-makers the likelihood
that crucial features of today’s forecasts will also be present in forecasts made in the future.