Bretteville-Jensen, Anne Line; Jacobi, Liana - Institute for the Study of Labor (IZA) - 2008
accessibility, however, provide alternative, non-causal explanations for the observed "staircase" pattern and yield potentially … importance of previous cannabis use, proneness and accessibility factors on hard drug initiation and to explore potential policy … initiation and, also, a more flexible correlation pattern for the unobservables. We find that proneness, accessibility and …