There is marked variability in both onset and rate of episodic-memory decline in aging.
Structural magnetic resonance imaging studies have revealed that the extent of age-related …

The association between quality of life (QoL) and social relationships is well established.
This paper further analyses whether and how participation in social activities as well as …

Firms tend to manage the diffusion of complex and uncertain technologies through a 'funnel',
whereby firms first experiment (test and learn), then decide to exploit and scale technology …

With reference to causal mediation analysis, a parametric expression for natural direct and
indirect effects is derived for the setting of a binary outcome with a binary mediator, both …

To estimate direct and indirect effects of an exposure on an outcome from observed data,
strong assumptions about unconfoundedness are required. Since these assumptions cannot …

We present and study semi-parametric estimators for the mean of functional outcomes in
situations where some of these outcomes are missing and covariate information is available …

Causal inference with observational data can be performed under an assumption of no
unobserved confounders (unconfoundedness assumption). There is, however, seldom clear …

Causal mediation analysis is used to decompose the total effect of an exposure on an
outcome into an indirect effect, taking the path through an intermediate variable, and a direct …

Sample selection arises when the outcome of interest is partially observed in a study. A
common challenge is the requirement for exclusion restrictions. That is, some of the …

Predictors of decline in health in older populations have been investigated in multiple
studies before. Most longitudinal studies of aging, however, assume that dropout at follow …