The central aim of many studies in population research and demography is
to explain cause-effect relationships among variables or events. For
decades, population scientists have concentrated their efforts on
estimating the 'causes of effects' by applying standard cross-sectional
and dynamic regression techniques, with regression coefficients
routinely being understood as estimates of causal effects. The standard
approach to infer the 'effects of causes' in natural sciences and in
psychology is to conduct randomized experiments. In population studies,
experimental designs are generally infeasible.
In population studies, most research is based on non-experimental
designs (observational or survey designs) and rarely on quasi
experiments or natural experiments. Using non-experimental designs to
infer causal relationships-i.e. relationships that can ultimately inform
policies or interventions-is a complex undertaking. Specifically,
treatment effects can be inferred from non-experimental data with a
counterfactual approach. In this counterfactual perspective, causal
effects are defined as the difference between the potential outcome
irrespective of whether or not an individual had received a certain
treatment (or experienced a certain cause). The counterfactual approach
to estimate effects of causes from quasi-experimental data or from
observational studies was first proposed by Rubin in 1974 and further
developed by James Heckman and others.
This book presents both theoretical contributions and empirical
applications of the counterfactual approach to causal inference.