Policy evaluation studies, which aim to assess the effect of an intervention, imply some statistical challenges:  real-world scenarios provide treatments which have not been assigned randomly and the analysis might be further complicated by the presence of interference between units.
<clarity> Policy evaluation studies, which aim to assess the effect of an intervention, imply some statistical challenges:  real-world scenarios provide treatments which have not been assigned randomly and the analysis might be further complicated by the presence of interference between units.
Policy evaluation studies, which aim to assess the effect of an intervention, imply some statistical challenges: in real-world scenarios provide treatments which have not been assigned randomly and the analysis might be further complicated by the presence of interference between units.